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JewIQ lists 2 assayers in the USA. Missouri (1) and New York (1) have the most listings.
2 exhibit at JCK Las Vegas. 2 have a street address confirmed from the company’s own website or by our team. Leading profiles include Jules Estate Buyers and GSI Gemological Science International.
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Ballwin · Bullion Dealer
Jules Estate Buyers is based in Ballwin, Missouri, and specializes in the acquisition of estate jewelry, fine watches, and precious metals. The company manages buying events for independent retailers across the United St
New York City · Assayer
Gemological Science International is a laboratory based in New York City. The firm provides gemstone identification and grading services for manufacturers and retailers. It utilizes proprietary technologies to analyze di
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FAQ
JewIQ lists 2 as of Oct 2026, ranked by profile completeness and trade-show presence. 2 have a confirmed street address.
Missouri (1) and New York (1). Open any of them above to see their listings.
2 exhibit at JCK Las Vegas. Each profile shows the shows and associations it is listed in.
From public JCK Las Vegas, JIS, VicenzaOro and HKJMA exhibitor and member directories, plus each company's own website. Locations marked approximate are derived from phone prefixes until the business confirms its address.
Open your profile and choose "Claim this listing". Verification with an email on your company domain is the fastest route, and claiming is free.