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Diamond Screening and Testing

Understanding the Lab Grown Market

Lab-grown diamonds (LGD) are increasingly popular, offering consumers highly attractive price and quality options. But our industry and reputations suffer when distributors sell undisclosed lab-grown diamonds (ULGDs).

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Our Policy

Stuller does not tolerate undisclosed lab-grown diamonds in our inventory. As added security, we further require our suppliers to screen all diamonds for lab-grown diamonds. Random samples of diamonds from all of our suppliers are also periodically sent out 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.

View Stuller's Proactive Measures

Why is Extensive Screening and Testing Needed?

  • In early 2017, the GIA’s lab in Mumbai screened a melee parcel and found almost one-third of the stones were lab grown.
  • Later in 2017, legendary diamond analyst Chaim Even-Zohar estimated that lab-grown diamonds valued at $750 million entered the global supply chain in 2016.

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

  • A zero-tolerance policy for ULGDs.
  • Stuller Gemological Lab, an advanced diamond screening lab run by a full-time Graduate Gemologist.
  • A strategic services arrangement with GIA.
  • The ability to screen all shapes and sizes of loose colorless melee (D to N) as well as jewelry.

Our Process

When you order diamonds from Stuller, you can have complete confidence. We have stayed at the forefront of diamond screening with robust practices that use the most advanced technology available.

Stuller Gemological Lab

Run by a full-time Graduate Gemologist, or lab has the advanced instrumentation used by laboratories around the world, and we maintain this level through continuous investment. Our screening technology includes:

  • De Beers’ second generation AMS2 which tests 3,600 stones per hour including many fancy shapes.
  • De Beers’ SYNTHdetect and PhosView and the GIA® iD100 Gem Tester.
  • Three advanced analytical spectrometers: the Fourier-Transform Infrared (FTIR), the Raman-PL, combining Raman light scatter spectroscopy with photoluminescence, and the UV-Vis-NIR, or Ultraviolet Visible Near Infrared spectrophotometer.
  • A J-Secure Plus for screening jewelry.

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 0.005ct through 0.24ct. After screening, their technology gives the stones a GIA color grade, the industry benchmark.

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8/16/2019 Market Prices:
Gold 1515.25 Platinum 836.00 Silver 17.16