Top 10 Synthetic Gemstone Manufacturers of 2025
- Written by Carat Island
- Last Updated on
Table of Contents
The synthetic gemstone industry has seen explosive growth over the past few years, driven by rising demand for ethical sourcing, affordability, and innovation in jewelry design. As sustainability becomes a key factor in consumer buying decisions, lab-grown gems are no longer niche—they’re mainstream.
But as interest grows, so does the number of suppliers. From industrial-scale labs to boutique creators, the market is filled with choices. So, how do you identify a trustworthy manufacturer who meets your needs for consistency, quality, and price?
To solve this, we've invested hours of research to create the definitive guide. This article breaks down the top 10 synthetic gemstone manufacturers in the world, helping you make an informed decision.
Our Ranking Methodology
To ensure this guide is both comprehensive and objective, we didn't just pick names out of a hat. We assessed each manufacturer on a specific set of criteria:
History & Reputation: How long have they been in business and what is their industry standing?
Technology & Quality: What manufacturing processes do they use, and how does it impact the quality and consistency of their gems?
Gemstone Variety: Do they specialize in specific gems or offer a wide catalog?
Client Trust & Target Market: Who are their primary customers (B2B, B2C), and what is their reputation for service and reliability?
Quick Comparison Table
|
Manufacturer |
Country |
Gemstone Types |
Manufacturing Tech |
|---|---|---|---|
|
Chatham |
USA |
Emeralds, Sapphires |
Flux, Hydrothermal |
|
Carat Island |
China |
Moissanite, Sapphires, Rubies, Emeralds, CZ |
Pulled Czochralski, Flame Fusion |
|
Djeva |
Switzerland |
Sapphire, Spinel |
Flame Fusion |
|
Gems N Gems |
Thailand |
Wide Gem Range |
Multiple |
|
Tianyu Gems |
China |
Moissanite, Lab Diamonds |
CVD, Fusion |
|
Swarovski |
Austria |
Zirconia, Crystals |
Proprietary |
|
Provence Gems |
China |
Moissanite, Lab Diamonds |
CVD, Flame Fusion |
|
Stars Gem |
China |
Moissanite, CZ |
Fusion & CVD |
|
Tairus |
Thailand/RU |
Beryls, Sapphires |
Hydrothermal |
|
Biron Gems |
Australia |
Emeralds, Beryls |
Hydrothermal |
The Top 10 Synthetic Gemstone Manufacturers of 2025
Here are our in-depth reviews of the world's leading gemstone suppliers.
Chatham
Chatham is arguably the most storied name in the lab-grown gemstone industry. Since Carroll Chatham's first experiments in the 1930s, the company has become synonymous with top-tier, American-made created gems. They are a brand name, not just a supplier, known for quality that often rivals their natural counterparts.
Key Details:
Gemstones Offered: Emerald, Ruby, Sapphire (Blue, Pink, Yellow), Alexandrite, Opal.
Manufacturing Process: Primarily Flux-growth and Hydrothermal methods.
Known For: Their iconic, richly saturated "Chatham Created Emeralds."
Pros:
✅ Unmatched Brand Recognition: The Chatham name carries weight with consumers and justifies a higher price point.
✅ Lifetime Guarantee: They offer a comprehensive guarantee on their stones, a huge trust signal for buyers and end-consumers.
✅ Made in the USA: A key selling point for jewelers targeting the North American market.
Cons:
❌ Premium Price Point: You are paying for the brand and quality, making them one of the most expensive options.
❌ Limited Variety: They focus on the "big three" (emeralds, rubies, sapphires) and don't offer budget options like CZ.
Best For: High-end jewelers, brands that want to leverage a famous name, and designers creating premium, non-bridal pieces.
Website: Visit the Chatham Website →
Carat Island
Based in China, Carat Island serves as a versatile and accessible partner for the global jewelry market. They specialize in a wide range of affordable lab-grown stones and offer full-service custom jewelry manufacturing, making them a one-stop shop for many brands.
Key Details:
Gemstones Offered: Moissanite, Cubic Zirconia, Lab-Grown Sapphire, Emerald, Ruby, and more.
Manufacturing Process: Flame Fusion, Pulled Czochralski, CVD.
Known For: Their flexible wholesale program and custom jewelry services.
Pros:
✅ Highly Competitive Pricing: One of the most affordable options for quality stones.
✅ Low Minimum Order Quantity (MOQ): Very friendly for startups and small designers testing new ideas.
✅ Full-Service Partner: They can go from loose stone to finished piece of jewelry.
Cons:
❌ Less Brand Prestige: Lacks the brand name recognition of suppliers like Chatham or Swarovski.
Best For: Boutique designers, Etsy sellers, and growing jewelry brands looking for an affordable and flexible manufacturing partner.
Website: Visit the Carat Island Website →
Djeva
Founded in 1933 in Monthey, Switzerland, Djeva is a specialist in the flame-fusion process, also known as the Verneuil method. They are renowned for producing exceptionally pure and consistent corundum and spinel for highly technical applications as well as for jewelry.
Key Details:
Gemstones Offered: Sapphire, Ruby, Spinel, and other corundums in a vast range of colors.
Manufacturing Process: Flame Fusion.
Known For: Swiss-grade precision and material purity, making their gems ideal for watches and scientific instruments.
Pros:
✅ Exceptional Consistency: Their industrial process ensures remarkable uniformity from batch to batch.
✅ Decades of Expertise: Nearly a century of experience in a highly specialized field.
✅ Purity of Material: Produces some of the cleanest corundum available.
Cons:
❌ Primarily B2B/Industrial Focus: Can be less accessible for small, independent jewelry designers.
❌ Limited to Flame Fusion: Doesn't offer hydrothermal or flux-grown gems with different inclusion patterns.
Best For: Watchmakers, industrial applications, scientific research, and gem cutters looking for clean, predictable rough material.
Website: Visit the Djeva Website →
Gems N Gems
Based in Bangkok, Thailand—a global hub for the gem trade—Gems N Gems operates as a massive supplier of both natural and lab-grown gemstones. Their key advantage is their sheer variety, acting as a one-stop shop for designers who need a wide array of different stones for their collections.
Key Details:
Gemstones Offered: An enormous catalog including lab-grown corundum, spinel, quartz, topaz, and more, alongside natural stones.
Manufacturing Process: They source from various manufacturers using multiple techniques.
Known For: Being a "supermarket" for gemstones with an unparalleled selection.
Pros:
✅ Incredible Variety: If a stone exists, they likely have it in both natural and lab-grown versions.
✅ Competitive Bangkok Pricing: Leverage their location in a major trade hub for good rates.
✅ Flexibility: Excellent for sourcing small quantities of many different types of stones at once.
Cons:
❌ Not a Direct Manufacturer: As a distributor, they don't control the production process, so quality can vary between stone types.
❌ Requires Specificity: Buyers need to be very clear about the quality grade they are looking for.
Best For: Jewelry designers who use a wide variety of stones, repair shops, and hobbyists looking for a single source for multiple gem types.
Website: Visit the Gems N Gems Website →
Tianyu Gems
A powerhouse in China’s Wuzhou gem district, Tianyu Gems has become a dominant force in the global moissanite and lab-diamond market. They are particularly well-known for their direct-to-consumer (DTC) and B2B sales via online platforms like Alibaba, making advanced cuts and custom designs widely accessible.
Key Details:
Gemstones Offered: Moissanite (all colors and cuts), Lab-Grown Diamonds (CVD & HPHT), Cubic Zirconia, Emeralds, Sapphires.
Manufacturing Process: Primarily CVD for diamonds and custom moissanite creation.
Known For: Their massive inventory, custom-cutting services, and strong presence in online jewelry communities.
Pros:
✅ Direct Factory Pricing: Highly competitive prices by cutting out middlemen.
✅ Extensive Customization: Can create virtually any cut or design a client requests.
✅ Huge Ready-to-Ship Inventory: Fast fulfillment for a wide range of standard and fancy shapes.
Cons:
❌ Navigating Communication: As a direct-from-factory supplier, communication requires clarity and precision, which can be a learning curve for new buyers.
❌ Brand Recognition: While huge in the trade, the name doesn't carry the same consumer prestige as a brand like Chatham.
Best For: Etsy sellers, independent online jewelers, and brands looking for custom cuts and affordable, direct sourcing.
Website: Visit the Tianyu Gems Website →
Swarovski Gemstones
While the world knows Swarovski for its iconic crystals, its professional division, Swarovski Gemstones, produces some of the most precisely machine-cut lab-grown stones available. They focus on perfection in calibration, consistency, and brilliance, serving the luxury fashion and jewelry markets.
Key Details:
Gemstones Offered: Swarovski Zirconia, Topaz, Sapphires, and other created stones.
Manufacturing Process: Proprietary precision-cutting technology.
Known For: The "Swarovski" brand name and flawless, machine-cut consistency.
Pros:
✅ Powerful Brand Association: Using Swarovski stones is a mark of quality and a strong selling point.
✅ Flawless Precision: Perfect for settings that require exact calibration and consistency.
✅ Exceptional Brilliance: Their cutting techniques are designed to maximize light performance.
Cons:
❌ High Price Point: You are paying a significant premium for the brand and the cut.
❌ B2B Focus: Primarily serves established business clients, not accessible for small-scale purchasing.
Best For: Luxury fashion houses, premium accessory makers, and high-end brands that benefit from co-branding with Swarovski.
Provence Gems
Provence Gems is another major player from Wuzhou, China, that has carved out a strong niche in the high-quality moissanite market, particularly for bridal and engagement jewelry. They are known for their brilliant cuts and for providing GRA certification with their stones, which adds a layer of trust for consumers.
Key Details:
Gemstones Offered: Specializes in colorless (DEF) and fancy-colored Moissanite. Also offers lab diamonds.
Manufacturing Process: Advanced CVD methods.
Known For: Excellent quality moissanite suitable for engagement rings and fine jewelry.
Pros:
✅ GRA Certification: Many stones come with a certificate, which is a strong selling point for engagement rings.
✅ Focus on Bridal Quality: They excel at producing the high-clarity, brilliant-cut stones demanded by the bridal market.
✅ Strong Online Reputation: Very active and well-regarded in social media jewelry groups.
Cons:
❌ More Specialized: Less variety in colored gemstones compared to broader suppliers.
❌ Minimum Order for Custom Work: While they do custom pieces, the best pricing is reserved for larger or repeat orders.
Best For: Jewelry brands focused on moissanite engagement rings, bridal jewelry retailers, and custom jewelers.
Website: Visit the Provence Gems Website →
Stars Gem
Stars Gem is a true B2B workhorse in the synthetic gem industry. While they serve a range of clients, their strength lies in large-scale production and fulfilling bulk orders for jewelry factories and wholesalers around the world. They prioritize efficiency, consistency, and volume.
Key Details:
Gemstones Offered: Moissanite, Cubic Zirconia, Lab Diamonds, Nano gems, and other created stones.
Manufacturing Process: Fusion & CVD.
Known For: Mass production capabilities and fast fulfillment for large B2B orders.
Pros:
✅ Excellent for Bulk Orders: Geared for high-volume, continuous supply chains.
✅ Cost-Effective at Scale: Their pricing is among the most competitive for large quantity purchases.
✅ Trusted in B2B Trade: A long-standing, reliable name for jewelry manufacturers.
Cons:
❌ Less Focus on a DTC Brand: Their business is not geared towards individual custom pieces in the same way as Tianyu or Provence.
❌ Website Can Be Less User-Friendly: Primarily designed for wholesale clients who already know what they need.
Best For: Jewelry factories, large-scale wholesalers, and established brands needing a reliable, high-volume supply chain partner.
Website: Visit the Stars Gem Website →
Tairus
Tairus is a joint Thai-Russian venture that represents the pinnacle of scientific gem creation. They are specialists in the complex hydrothermal process, focusing on growing gems that are difficult to create, such as high-quality alexandrite, emerald, and sapphire. Their output is prized by collectors and high-end jewelers.
Key Details:
Gemstones Offered: Hydrothermal Emerald, Sapphire, Ruby, and famously, color-change Alexandrite.
Manufacturing Process: Exclusively Hydrothermal.
Known For: Producing some of the finest and rarest lab-grown gems in the world.
Pros:
✅ Specialists in Rare Gems: One of the few reliable sources for top-grade created Alexandrite.
✅ Exceptional Quality: Their research-driven approach yields gems with superb clarity and color.
✅ Collector's Choice: Highly regarded by gemologists and collectors for their quality.
Cons:
❌ Expensive and Limited Supply: This is boutique, high-end production, not mass-market.
❌ Difficult to Source: Not as commercially widespread as other manufacturers.
Best For: High-end bespoke jewelers, gem collectors, and designers looking for unique, top-quality stones that stand out.
Website: Visit the Tairus Website →
Biron Gems
Based in Australia, Biron is one of the original and most trusted names in hydrothermal emeralds. With a legacy stretching back decades, they have built a formidable reputation for producing ethically sourced, high-clarity created emeralds that rival the color of fine Colombian naturals.
Key Details:
Gemstones Offered: Primarily Emeralds; also other Beryls like Morganite and Aquamarine.
Manufacturing Process: Hydrothermal.
Known For: Their signature "Biron Emeralds," which are exceptionally clean and vibrant.
Pros:
✅ Strong Legacy & Trust: A well-established and respected name, particularly in Western markets.
✅ Premium Emerald Quality: Known for producing stones with very few inclusions and excellent color.
✅ Ethical Branding: Their Australian base and long history contribute to a strong ethical appeal.
Cons:
❌ Highly Specialized: Their focus is almost exclusively on emeralds and other beryls.
❌ Premium Pricing: Their quality and reputation command a high price.
Best For: Ethical jewelry brands, fine jewelers specializing in emeralds, and discerning clients who prioritize quality and provenance.
Website: Visit the Biron Gems Website →
How to Choose the Right Manufacturer for Your Needs
Not all suppliers are created equal. Here’s a quick guide to help you find your match based on your business goals.
👑 If You Need Prestige & Brand Power... Your best bets are Chatham and Swarovski. These names are recognized by consumers and add tangible value and trust to a finished piece, allowing for premium pricing.
💍 If You're a Small Business or Startup... Look to Carat Island and Gems N Gems. Both are known for their flexibility, offering lower minimum order quantities (MOQs) and a wide variety of stones. This allows you to experiment with different designs without a massive upfront inventory investment.
💸 If You're Looking for Maximum Affordability & Scale... The Chinese powerhouses Tianyu Gems, Provence Gems, and Stars Gem are your go-to sources. Their scale allows for extremely competitive factory-direct pricing, ideal for brands that need a large volume of moissanite or other popular gems.
💎 If You Specialize in Emeralds or Rare Gems... Focus on the specialists. Biron Gems and Tairus produce collector-quality hydrothermal emeralds and other rare beryls that are prized for their clarity and color. Chatham also remains a top choice for premium emeralds.
Conclusion
The synthetic gemstone market is rich with opportunity—and competition. Whether you’re a jeweler seeking top-tier stones with a story or a brand looking for cost-effective, scalable sourcing, one of these 10 suppliers is likely your perfect partner.
Prioritize what matters most to your business—be it quality, MOQ, brand name, or specialty—and use this guide to make an informed decision. By aligning with the right manufacturer, you can build a successful and sustainable jewelry business.
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