St. Louis Guild Meeting
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When: Monday, October 28, 2019
6:00 PM
Where: Hanley Corporate Tower
101 South Hanley Road
4th Floor
Clayton, Missouri  63105
United States

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Cost: $25 - Online. Space is limited! Order online to secure your seat.
Schedule: 6:00 p.m. - Cocktails and hors d'oeuvres
7:00 p.m. - Presentation with Q&A



The St. Louis Guild Presents

Laboratory-Grown Diamonds...the Market, the Screening Devices, and the Facts
Harold Dupuy, FGA, Vice President, Strategic Analysis, Stuller Inc.


Harold Dupuy, FGAJoin the St. Louis Guild as they learn about laboratory-grown diamonds from industry expert, Mr. Harold Dupuy.

Are you concerned with undisclosed laboratory-grown diamonds? Are you confused by the more than 40 instruments available, each with their own manufacturers’ claims? If so, this Guild event is for you.

This presentation will cover the following:

  • History of laboratory-grown diamonds, production methods, and producers
  • Consumer markets, market share, FTC Guidelines
  • Pricing
  • Screening vs. detection
  • Testing the Testers
    • DPA’s ASSURE Project
    • What is DVI?
    • Testing process
    • Performance results
    • What instruments to buy?
    • One company’s journey
  • What's a retailer to do?

Mr. Dupuy is a Fellow of The Gemmological Association of Great Britain, a Graduate Gemologist from GIA, a Master Gemologist Appraiser® from the American Society of Appraisers and currently serves as Vice President, Strategic Analysis for Stuller Inc.





Mission Statement

The American Gem Society (AGS) is a nonprofit trade association of fine jewelry professionals dedicated to setting, maintaining and promoting the highest standards of ethical conduct and professional behavior through education, accreditation, recertification of its membership, gemological standards, and gemological research.

The Society is committed to providing educational products to inform and protect the consumer and to contributing to the betterment of the trade by creating industry standards to protect the jewelry-buying public and the fine jewelry industry as a whole.

AGS Laboratories, founded to support the AGS mission, is a nonprofit diamond grading laboratory with a mission of consumer protection. Adhering to the AGS Diamond Grading Standards, AGS Laboratories is dedicated to offering diamond grading reports that provide consistency and accuracy based on science.

American Gem Society