Custom Premium Branding Packaging for Jewelry Brands

Turn your jewelry vision into packaging that reflects your brand standard — not just your logo.

“I Wish I Had Defined My Packaging Standards Earlier.

Have you experienced these frustrations when customizing jewelry packaging?
5 struggles before meeting the right jewelry partner

Table of Contents

Stop trusting brochures. Start asking the right questions

How To Tell If A Jewelry Manufacturer Is Truly Reliable?

Most bad sourcing experiences start the same way — flashy catalogs, smooth talkers, and promises that fall apart after the order is placed. This guide helps you cut through the noise and recognize the red flags before it’s too late — with real questions, real supplier signals, and no more second-guessing.
Jewelry production. The process of fixing stones

“Think You’ve Found the Right Supplier? Think Again.”

When it comes to sourcing jewelry, most brand owners focus on price, catalog, and MOQ — but overlook what truly determines success: trust, transparency, and long-term thinking.


We’ve seen it happen too often.

  • 💸 A buyer chooses a supplier because of a beautiful catalog and a lower quote — only to discover poor quality, hidden fees, and broken promises.
  • 📉 Others fall for overpromising sales reps who say “yes” to everything but vanish when production goes wrong.
  • 🕵️‍♂️ Some never realize they’re working with a trading company, not a real manufacturer — until delays, miscommunication, and lack of control kill their momentum.

These mistakes don’t just waste money — they hurt your brand’s reputation and customer trust.

And the worst part? Most problems are only discovered after the order is placed.

You don’t get a second chance to make the right first choice. That’s why this guide exists.


👇 So how do you avoid making the same expensive mistake?
The following 8 critical signs checklist is what experienced buyers use to evaluate jewelry manufacturers — before sending a single dollar.

Your brand deserves better than “hope for the best.”
Let’s help you verify who’s really worth working with.

  • Ask: “How experienced are your engineers and quality control staff?”
    📌 What to look for: 10+ years in jewelry production, dedicated QC team, and technical expertise to guide your development.
  • Ask: “Do you have full in-house production or do you outsource?”
    📌 Why it matters: Fewer handoffs = fewer mistakes. Integrated factories solve issues faster and protect your designs.
  • Ask: “Can I track production progress? Any hidden costs?”
    📌 What to avoid: Vague updates, surprise charges. A reliable partner shows you every step — and owns every problem.
  • Ask: “How do you ensure quality consistency in bulk orders?”
    📌 What to expect: Batch-level inspection, sample confirmation process, rejection tracking — not excuses.
  • Ask: “Are your materials certified? Do you meet EU/US compliance?”
    📌 Red flags: No certification, no reports. A trusted supplier provides SGS/REACH/CA65 proof without hesitation.
  • Ask: “Do you offer eco-friendly materials with documentation?”
    📌 Bonus credibility: If they can provide recycled silver (RJC) or eco options with traceability, they care about brand values — like yours.
  • Ask: “Can I start with a low MOQ and scale up fast if it works?”
    📌 Trusted factories: support your growth. If they only want 1000-piece orders, they don’t understand your brand journey.
  • Ask: “Can you handle shipping, export documents, and customs clearance?”
    📌 What it shows: Real factory partners help your order arrive on time — without causing border delays or paperwork headaches.
  • jewelry assembly packaging sobling

    “Don’t Fall for These Traps When Choosing a Supplier”

    It’s easy to fall for surface-level impressions — a slick catalog, smooth communication, or an unbelievably low price. But these can hide real risks.
    In this section, let’s break down the common assumptions that lead to costly sourcing mistakes — and reveal what you actually get behind the scenes.

    What You Think What You Actually Get
    “Their catalog looks amazing — they must be good.” Catalog ≠ factory. You’re seeing what they want you to see, not how they actually produce.
    “They said yes to everything — that’s a good sign, right?” Overpromising is a red flag. A good factory explains limits and sets real expectations.
    “They said they’re a manufacturer on Alibaba.” Many “factories” outsource 80% of the work. Ask who actually makes your jewelry.
    “Low price = best deal.” Hidden costs and quality issues cost more in the long run.
    “We can figure things out after the sample.” Most problems appear in bulk, not sample. That’s too late to fix.

    Conclusion

    A visually impressive catalog or friendly communication often creates a false sense of confidence. However, many common sourcing issues — from hidden outsourcing to unclear pricing — stem from overlooked red flags. Clear evaluation standards and the right questions can help avoid costly mistakes and protect brand trust.

    But knowing the risks is just the first step. In the next section, let’s put a real factory to the test — and see if Sobling truly lives up to these standards.

    One reliable system behind every order

    What makes Sobling Reliable as a Jewelry manufacturer?

    End-to-end manufacturing — from design to QC — with fewer handoffs, fewer surprises, and faster issue resolution. Sobling helps reduce risks with in-house control at every stage. Here’s how Sobling delivers on the 8 reliability factors.

    How Sobling Meets All 8 Reliability Benchmarks — With Proof.

    1. Experienced Team

    Ask: “How experienced are your engineers and quality control staff?”
    What to look for: 10+ years in jewelry production, dedicated QC team, and technical expertise to guide your development.

    Yes, The Sobling team have spent 10+ years managing jewelry manufactring and designs

    From production managers to designers and quality control staff, each member brings over 10 years of hands-on experience in the jewelry industry. That means fewer misunderstandings, faster project turnaround, and better support for your specific goals.
    Sobling jewelry factory manufacturing General manager
    Mr. Wu
    CEO
    18 years' experiences of jewelry business, specialized in team management, factory operation management, quality system management.
    Sobling jewelry factory production manager
    John
    Production Manager
    Entered into Fashion Jewelry line since 2012, 10 years rich experiences in Jewelry Production & Quality Control.
    Sobling jewelry factory sales manager Heman
    Heman
    Sales Manager
    12 years' experiences of jewerly sales, specialized in marketing, customer services, projects management.
    Jojo jewelry designer Sobling 500x667
    Jojo
    Jewelry Designer
    10 years' rich experiences, specialized in creative designs of fashion jewelry.
    Sobling jewelry factory manufacturing Development manager
    Leon
    Development Manager
    Entered into Jewelry line since 2008, over 14 years experiences of jewelry modeling & jewelry development.

    2. Integrated Facilities

    Ask: “Do you have full in-house production or do you outsource?”
    Why it matters: Fewer handoffs = fewer mistakes. Integrated factories solve issues faster and protect your designs.

    Yes, please See the Real Factory as below Behind Your Jewelry Orders.

    Photos show Sobling’s actual factory and showroom — not borrowed visuals. Full in-house production means fewer delays, clearer communication, and more reliable results for your brand.
    Sobling jewelry factory manufacturing building
    Sobling Jewelry factory building
    Sobling jewelry factory manufacturing process samples show
    Sobling Jewelry factory showroom

    3. Transparent Process

    Ask: “Can I track production progress? Any hidden costs?”
    What to avoid: Vague updates, surprise charges. A reliable partner shows you every step — and owns every problem.

    Yes, You Can Track Every Step — No Hidden Charges, No Guesswork.

    Real factory workflow shown below — not stock photos. Sobling’s transparent, in-house process ensures clear progress updates, faster response, and no surprise fees.
    Sobling jewelry factory manufacturing process Wax inject
    Sobling Jewelry factory wax injector
    Customized Jewelry
    Sobling Jewelry factory laser engraving
    sobing jewelry factory casting 2
    Sobling Jewelry factory casting
    Sobling jewelry factory manufacturing process finished products package
    Sobling Jewelry factory Package
    Sobling jewelry facotry over view
    Sobling Jewelry factory inner view
    sobing jewelry factory casting 2
    Sobling Jewelry factory Casting
    Sobling jewelry factory manufacturing process 3d designers CAD
    Sobling Jewelry factory 3D Modelling
    Sobling jewelry factory manufacturing process welding
    Sobling Jewelry factory welding
    sobing jewelry factory Plating 1
    Sobling Jewelry factory Rhodium Plating
    Sobling jewelry factory manufacturing process magnetic pins Polishing 2
    Sobling Jewelry factory magnetic polishing
    Sobling jewelry factory manufacturing process rolling Polishing 1
    Sobling Jewelry factory rolling polishing
    sobing jewelry factory Plating 2
    Sobling Jewelry factory gold plating

    4. Strict Jewelry Quality Control

    Ask: “How do you ensure quality consistency in bulk orders?”
    What to expect: Batch-level inspection, sample confirmation process, rejection tracking — not excuses.

    Quality Checks at Every Stage — So You Don’t Get Surprises in Bulk Orders

    From 3D design to final inspection, every piece is checked for defects. Sobling’s step-by-step QC process ensures consistent quality, even in large orders.
    Step 1
    3D Molds' Quality Control
    Your jewelry 3D model is created by Sobling designers with 8 years of experience using professional software JewelCAD and Gemvision Matrix with an accuracy of 0.01 mm.
    Step 2
    Raw Materials Inspection
    The raw materials of your jewelry are tested with professional equipment to ensure compliance with EU standards, including wax materials, metal content, and gemstone grade. etc.
    Step 3
    QC During Production Process
    During the production process, each piece of your jewelry is inspected 100% in accordance with Sobling's high standards and every quality defect is eliminated with the utmost care.
    Step 4
    100% inspection of finished products
    Each piece of your jewelry is 100% inspected to ensure that it meets high quality fine jewelry standards and that defective products are removed.

    5. Certified Materials & Compliance

    Ask: “Are your materials certified? Do you meet EU/US compliance?”
    Red flags: No certification, no reports. A trusted supplier provides SGS/REACH/CA65 proof without hesitation.

    Yes, Your Jewelry Certified to Global Standards — No Guesswork, No Harmful Surprises

    From 3D design to final inspection, every piece is checked for defects. Sobling’s step-by-step QC process ensures consistent quality, even in large orders.
    TUV Certificated EU Reach Standard Compliance quality
    TUV Certified EU Reach Standard Compliant quality

    No harmful chemicals → Safe for global markets

    TUV Certificated Salt Spray Corrosion Compliance Quality
    TUV Certified Salt Spray Corrosion Compliant Quality

    Strong anti-rust protection → Jewelry shines longer

    SGS-Certificated-999-Silver-Grain-Content-Test
    SGS Certified Genuine 999 Silver Content Raw Material

    Genuine 999 silver → Real purity guaranteed

    Jewelry Plating Test report - FISCHER Certified Honest Plating Compliant Quality
    FISCHER Certified Honest Plating Compliant Quality

    Durable triple plating → Lasting beauty, less fading

    6. Sustainable Options

    Ask: “Do you offer eco-friendly materials with documentation?”
    Bonus credibility: If they can provide recycled silver (RJC) or eco options with traceability, they care about brand values — like yours.

    Yes, Eco-Friendly Jewelry Backed by Real Test Reports and Certifications

    Sobling offers recycled silver (RJC) and SGS/Proposition 65 certified materials with full documentation. These certifications show alignment with global environmental standards — reassuring for conscious brands and safe for global markets.
    SGS-Certificated-999-Silver-Grain-Content-Test
    SGS Certified 999 Silver Grain Content Test
    SGS-Certificated-California-Proposition-65-Test-report
    SGS Certified California Proposition 65 testing report
    Responsible-Jewelry-Council-Recycled-Silver-Source
    Responsible Jewelry Council Recycled Silver Source
    ECHA-211-Substances-Test-Report
    European Chemicals Agency 211 Substances Test Report

    7. Flexible MOQ & Capacity

    Ask: “Can I start with a low MOQ and scale up fast if it works?”
    Trusted factories: support your growth. If they only want 1000-piece orders, they don’t understand your brand journey.

    Yes, Start small, Scale Fast — Flexible MOQ 10pcs & Production Capacity

    Sobling supports low MOQs so you can test new products without high risk. As your orders grow, our in-house team and scalable facilities help ramp up quickly — no delays, no excuses.
    moq benefits compare
    jewelry factory polishing

    8. Global Logistics & Export Know-how

    Ask: “Can you handle shipping, export documents, and customs clearance?”
    What it shows: Real factory partners help your order arrive on time — without causing border delays or paperwork headaches.

    Yes, On-Time Global Shipping With Full Export Support

    Sobling handles shipping, export papers, and customs — ensuring your jewelry arrives on time without delays.
    Customized Jewelry
    Take Sobling as an Example — See What Real Reliability Looks Like

    More Factors to consider when choosing a reliable supplier

    Choosing a supplier isn’t just about price. It’s about long-term support, scale potential, and minimized risk. Sobling’s real-factory setup, certified quality, and full-stack capabilities show what a truly reliable partner looks like — beyond pretty brochures.

    9. What we do?

    Sobling is a professional Silver Jewelry Manufacturer Since2012, specialized in providing jewelry brands with All-in-one Solutions for Silver Jewelry ODM & OEM dedicated to provide higher quality products and better 1vs1 VIP Serivces to enable your jewelry business grow faster and bigger!​

    Covering 1400m²

    Factory area

    162 Experienced

    Workers and staffs

    1.08 Million pieces

    Annual capacity

    Total $8.3 Million

    Annual turnover

    Oval sapphir halo ring jewelry settings

    10. Advanced Technology & Modern Equipment

    Ask: “What kind of equipment do you use? Do you have advanced tools for precision jewelry production?”
    Why it matters: High-end equipment = better precision, consistency & quality. It reflects a factory’s professionalism and production reliability.

    11. All-in-One Custom Jewelry Services — From Idea to Delivery

    Ask: Can you handle everything from design to delivery — or do I need to coordinate multiple vendors?”
    Why it matters: Fewer vendors = fewer delays, lower risks, better quality control. All-in-one support keeps your supply chain simple and stress-free.

    SAY GOODBYE TO THE CHAOS!

    Sobling offers All-In-One Cutom Jewlery Services, handles every step in-house — so you don’t have to chase different vendors. Save time, reduce costs, and get to market faster with our 9 complete services.

    • Jewelry Creative Design – Unique design concepts tailored to your brand.
    • Jewelry 3D Modeling – Accurate 3D files for precise manufacturing.
    • Jewelry Manufacturing – In-house production with consistent quality.
    • Jewelry Products Testing – Rigorous quality checks before delivery.
    • Customize Package – Branded packaging tailored to your market.
    • Jewelry Photography – Professional visuals for your marketing.
    • Jewelry 3D Rendering – Realistic product previews for pre-sale campaigns.
    • Door To Door Delivery – Global shipping handled start to finish.
    • Custom Logo Engravings – Personalize products with your brand identity.

    Customized Jewelry
    Jewelry Creative Design
    Customized Jewelry
    Jewelry 3D Modeling
    Customized Jewelry
    Jewelry Manufacturing
    Customized Jewelry
    Customize Package
    Customized Jewelry
    Jewelry Products Testing
    Customized Jewelry
    Door to Door Delivery
    Customized Jewelry
    Jewelry Photography
    Customized Jewelry
    Jewelry 3D Rendering
    Customized Jewelry
    Custom Logo Engravings

    12. All-in-One Products Solution — Thousands of Options to Grow Your Jewelry Brand

    Ask: “What kind of products can you offer? Do you cover different categories and styles?”
    Why it matters: A reliable manufacturer isn’t limited to one product type — they offer full-range options to support your evolving brand, save sourcing time, and reduce supplier risks.
    ST2215_1 925 sterling silver rhombus shape jewelry set with 3A CZ micropaved settings
    Sterling silver CZ Jewelry

    925 sterling silver rhombus shape jewelry set with 3A CZ micropaved settings from Sobling

    T16A-1 2_1 Round 1.0ct halo settings GRA Moissanite jewelry set with necklace and bracelet and stud earring
    Moissanite Jewelry

    925 sterling silver jewelry set with round DEF GRA certificated moissanite from Sobling

    S014B-1 Aquamarine cushion jewelry set of pendant & ring
    Brass CZ Jewelry

    Brass/Copper jewelry with clear CZ and cushion aqua glass settings from Sobling

    ST2572E RG 2_1 Synthetic opal rose gold plating earring with Amethyst CZ and black rhodium plating
    Synthetic Gems Jewelry

    Synthetic opal rose gold plating earring with Amethyst CZ and black rhodium plating from Sobling

    Natural baroque amtheyst beads bracelets with hand-crafted knitted rope amethyst bracelet 2
    Semi-Precious Jewelry

    Natural baroque amtheyst beads bracelets with hand-crafted knitted rope from Sobling

    PES028_0001 Natural 5A freshwater pearl stud earring with CLear AAACZ micropaved prong settings

    Freshwater Pearl Jewelry

    Natural 5A freshwater pearl stud earring with CLear AAACZ micropaved prong settings from Sobling

    13. Other Data That Reveals Real Manufacturing Strength

    Ask: “Can you share real data about your team, markets, and production strengths?”
    Why it matters: Numbers don't lie. Verified data on worker expertise, product mix, and global reach helps you judge if a factory can meet your scale, quality, and market needs.
    Sobling Factory Data
    Sobling various of kinds Products Proportion 3
    Sobling jewelry Proportion Workers experiences_1
    Sobling Business scope
    Sobling jewelry Proportion Clients from_1
    Avoid costly mistakes — use this checklist to evaluate any factory before you commit.

    How to Choose the Right Jewelry Manufacturer — Take Sobling as a Benchmark

    Use this supplier checklist to avoid costly mistakes. See how Sobling compares — so you can choose a manufacturing partner that supports your growth, not slows it down.

    Choosing a supplier is more than just comparing prices. You need to know whether they’ll deliver what they promise, communicate clearly, and help you meet your deadlines — without unpleasant surprises. This comparison checklist helps you evaluate your current vendor, and understand if it’s time to consider a better, more transparent alternative.


    Key Factor What to Look For How Sobling Measures Up
    Production Transparency Live updates, photos, or videos Real-time updates, video calls, factory visits
    Certified Materials Traceable, documented sources RJC, SGS, EU-tested silver
    Flexible MOQ Start small, scale easily 10pcs to 10,000pcs capacity
    In-House Manufacturing Avoid outsourcing risks Full in-house control
    Full-Service Support Design, testing, packaging, delivery All-in-one 9-step service
    Global Track Record Export to major markets 31+ countries, 1,500+ projects
    Responsive Team Fast communication, helpful advice < 24h reply, English-speaking team

    After going through the checklist, you might realize your current supplier falls short in some key areas. That doesn’t mean switching is easy — but staying with the wrong partner is costly in the long run. Use these points to ask better questions, set clearer expectations, and work with a supplier who supports your growth, not one who holds it back.

    Why choose Sobling jewelry factory as your long-term partner

    Why Jewelry Brands Like Yours Choose Sobling

    It’s not just about producing jewelry. It’s about building a reliable, transparent, and scalable partnership. Here’s why Sobling stands out among other manufacturers.

    70% Time Saving

    Shorten your supply Chain

    40% cost saved

    Factory Direct Price, No Middleman

    100% Risk-Free

    30 day return Guarantee

    7x24 VIP services

    Rapid response to cut your waiting time

    What You’ll Actually Gain from Working with Sobling


    • ✅ Better Quality: TUV certified & REACH compliant. Fewer defects, happier customers.
    • ✅ Better Service: 30-day return, 360-day warranty. Peace of mind for your business.
    • ✅ Fewer Headaches: All-in-one solution from design to delivery.
    • ✅ Lower Costs: Free design & 3D modeling. Save on time and development expenses.

    smiling-customer-services
    ODM and OEM Custom Cases

    Proven Success: 1500+ Custom Jewelry Projects Delivered

    custom made engagement ring
    custom lifetree pendant case
    custom design process rings
    Custom engagement ring case
    custom made hiphop pharon pendant
    Custom made personal hiphop iced out pendant
    pemium jewelry pacakge 2

    Custom packing design case

    4.35ct Halo Cushion Cut Bridal Wedding Engagement Ring Diamond Simulated 925 Sterling Silver Anniversary Ring 4

    Jewelry 3D Rendering case

    photoshooting images

    Luxury jewelry video case

    Trusted by 100+ Brands Worldwide

    What Our Clients Say About Sobling

    More than 112 clients from 31 countries trust us, the count is increasing...
    Years' Experiences
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    Successful Projects
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    Worldwide Customers
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    Customer Satisfaction
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    June-Hong-Kong-Jewellery-and-Gem-Fair
    Sobling Jewelry factory June HK Show
    202403 hk jewelry show heman and lulu.jpg
    Sobling June HK Show Heman
    Jewellery_and_Gem_World_logo_RGB_S_v4
    Sobling Jewelry factory UBM HK Show
    DSC01700 sobling HK jewelry fair heman and customer
    Sobling Jewelry factory customer
    Reviews
    What People Say
    Hear from our happy customers
    Nealay
    Nealay
    Owner - Silversilkonline
    "We have been purchasing from Sobling since 2012. In the past, I had always received a quick response and my orders have been delivered on time. My customers are satisfied with their quality, generally over 99% satisfaction."
    Jorge
    Jorge
    Sourcing Manager - HIPHOPBLING
    "Overall, our purchase from Sobling has gone very smoothly. The quality of the products has remained consistent and the after-sales service is fast and reliable. The all-in-one solution has saved us 20% cost, especially with the free service for jewelry photography and product data files."
    Lisa
    Lisa
    PD Manager - SilverPlanet
    "I am very happy to work with Sobling because they are very professional in jewelry and have a strong competence in product development, that helped me overcome a lot of difficulties in materials' innovation and creative design."
    Hassan
    Hassan
    Vice President - Elaf Jewellery
    "Sobling All-in-one Services Solution is excellent, we don't have to spend a lot of time asking questions and negotiating with various suppliers, saving us 50% of our time and potential trial order costs. Their quality is reliable, their service is trustworthy, and giving us a very good reputation in our place.”

    Free 3D Designs For You, Get $50 Bonus on Your First Orde

    Start your custom jewelry project today — free design + $50 off your first order.

    Limited Time Offer, Ends on Today!

    Hours
    Minutes
    Seconds
    Extended Readings of Sourcing jewelry from new suppliers

    10 Practical Tips No One Told You — Until Now

    This extended reading walks you through the real-world lessons that buyers wish they knew earlier — from verifying supplier credibility to protecting your first order. Whether you're new to global sourcing or just tired of getting burned, this guide is your no-nonsense companion to make smarter, safer choices. No fluff. No sales pitch. Just tips that actually help.
    Before placing an order, take time to research the supplier. Look for an official website, traceable business address, verifiable legal name, and active business license. If available, search for past reviews or complaints. Don’t just rely on beautiful catalogs — even small warning signs can become big issues later. Trust needs evidence.
    Misunderstandings often come from vague requirements. Provide detailed information: metal type, plating, dimensions, stones, packaging, etc. Ask for spec sheets, drawings, and samples before confirming. Suppliers that “figure it out as they go” are more likely to mess things up. Clarity upfront saves headaches later.
    Many suppliers show factory photos — but outsource most production. Ask directly: “Do you manufacture this in-house?” and request a video call or factory visit. Relying on middlemen leads to delays, quality risks, and higher costs. Partnering with real manufacturers ensures more control and accountability.
    Different suppliers have different tolerances. What you see as a defect, others might consider acceptable. Ask about QC processes, standards, and inspection points. What’s their reject policy? Request sample reports. Quality issues rarely show up in sample stage — bulk consistency is the real test.
    Hidden costs — like mold fees, shipping, or packaging — often appear after the order is placed. Ask for a full quote with breakdowns. Clarify who pays for reworks or delays. Cost transparency reflects business integrity. If pricing is vague or constantly changing, reconsider.
    Avoid placing large orders with unproven suppliers. Test with a small batch, even if the cost per unit is higher. This lets you check communication, quality, and fulfillment before investing more. A reliable supplier will support growth — not pressure you into volume commitments.
    Ask for documentation proving materials are safe and compliant with your country’s regulations (like REACH, CA65, nickel-free). Non-compliance can lead to legal trouble or customer complaints. Good suppliers are transparent and provide test reports willingly — if not, that’s a red flag.
    Avoid vague promises like “we’ll do our best.” Ask for detailed production timelines: sampling, mass production, packaging, and shipping. Also ask how they handle delays. If lead times shift often, that’s a sign of poor internal control or overbooking — which affects your launches.
    Problems happen — what matters is how suppliers respond. Ask: what’s your policy if the product arrives with issues? How fast can you respond? Is there a dedicated account manager? A true partner doesn’t disappear after receiving payment.
    Cheapest price today may lead to the most expensive lesson tomorrow. Focus on who will support your growth, adapt with your needs, and offer insights. Strong sourcing isn’t just about finding a vendor — it’s about building supply chain stability and trust over time.

    A Custom Jewelry Factory Built for Brands Like Yours

    OEM & ODM | Fast Sampling | Sustainable Materials

    Click The Triangle button to wiew our factory

    CERTIFICATIONS

    Sobling Respects Quality Standards​

    Sobling comply with Quality certificates as TUV CNAS CTC

    Next Generation Jewelry OEM

    CERTIFICATIONS

    Sobling Respects Quality Standards​

    Sobling comply with Quality certificates as TUV CNAS CTC