Diamond Screening and Testing
Stuller Has Taken a Leadership Position
As a major supplier, we are in a position to protect our supply chain, your reputation, and your customer’s confidence. We gladly accept this responsibility by maintaining
View Stuller's Proactive MeasuresUnderstanding the Lab-Grown Market
Lab-grown diamonds (LGDs) have become increasingly popular, offering consumers highly attractive price and quality options they previously may not have been able to afford. A laboratory-grown diamond, also known as “laboratory-created,” “synthetic,” or simply “lab-grown,” is a diamond that appears identical to its natural, earth-mined counterpart. It possesses the same chemical composition and physical properties as a natural diamond. Even to the experienced professional eye, lab-grown diamonds look exactly the same as a natural diamond.
Shop All DiamondsWhy is Extensive Screening and Testing Needed?
Our industry and reputations suffer when undisclosed lab-grown diamonds (ULGDs) are sold. Since 2017, the industry media has covered dozens of ULGD issues reported by leading gemological laboratories. The frequent news reported on all types of goods including loose stones, mixed melee parcels, and disclosure issues within mounted jewelry. This trend repeatedly demonstrates the increased prevalence of these cases in the market and fuels consumer awareness of the new issue.
Stuller's Screening Process
When you order diamonds from Stuller, you can have complete confidence in your purchase. We remain at the forefront of diamond screening with robust practices that use the most advanced technology available.
Our screening technology includes
As added security, we require our suppliers to screen all diamonds for lab-grown diamonds before shipping to Stuller. In addition, random samples of diamonds from all of our suppliers are periodically sent to leading laboratories to check for lab-grown diamonds.
By incorporating these protocols, Stuller extends confidence and security to our customers, ensuring that you are getting exactly what you purchase.
Stuller Gemological Lab™
Referrals from Stuller's screening processes and the Melee Analysis by GIA are sent to the Stuller Gemological Lab for further testing. Lead by an FGA (Fellow Gemmological Association of Great Britain) certified gemologist and a team of GIA Graduate Gemologists, our lab has advanced instrumentation used by leading laboratories worldwide.
The Stuller Gemological Lab instruments include
Melee Analysis by GIA®
Stuller has a strategic service arrangement with GIA (Gemological Institute of America), which is a separate entity from Stuller. It's staffed by GIA specialists who use GIA's proprietary technology to perform their work.
GIA’s equipment screens round melee diamonds in sizes 0.005 carat through 0.24 carat. After screening, their technology gives the stones a GIA color grade, the industry benchmark.
At the Forefront of Research
The Stuller team is committed to actively researching lab-grown diamond screening and detection methods, and sharing those findings with the industry. Notable research and discoveries made by our specialists have been published by the most respected scientific journals of the industry, positioning Stuller as a pioneer in the field .
Some of our team contributions include
- Selecting a Diamond Verification Instrument Based on the Results of the Assure Program - An Initial Analysis
Journal of Gemmology; 2019, Vol. 36, Issue 7
View PDF - 3 Near-Colourless HPHT-grown Synthetic Diamonds that Test as Synthetic Moissanite
Journal of Gemmology; 2021, Vol. 37, Issue 6
View PDF - Rare Mixed Type IaB-IIb Diamond with a Long-Lasting Phosphorescence
Gems and Gemology; Summer 2021, Vol. 57, No. 2
View PDF