Assayers worldwide
JewIQ lists 8 assayers in 5 countries. Italy (3), United States (2) and Belgium (1) have the most listings. Common specialties include diamond grading, gemmological services and gemstone analysis.
5 exhibit at VicenzaOro, 3 at JCK Las Vegas. 6 have a street address confirmed from the company’s own website or by our team. Leading profiles include Jules Estate Buyers, GSI Gemological Science International and Dsef German Gem Lab.
Choose a country
Assayers by country
- IT
Assayers in Italy
3 companies
- US
Assayers in the USA
2 companies
- BE
Assayers in Belgium
1 company
- DE
Assayers in Germany
1 company
- HK
Assayers in Hong Kong
1 company
Top profiles
Leading assayers
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
JCK Las Vegas exhibitorNew 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
JCK Las Vegas exhibitorIdar-Oberstein · Assayer
Based in Idar-Oberstein, Germany, Dsef German Gem Lab operates as a specialist in the gemstone sector. The laboratory provides professional services and analysis for the trade. They participate in international industry
VicenzaOro exhibitorAltavilla Vicentina · Assayer
Based in Altavilla Vicentina, Italy, this business operates as an assay office for precious metals. The laboratory provides testing and analysis services for the local jewellery trade. It also participates as an exhibito
VicenzaOro exhibitorMilano · Assayer
Based in Milano, Italy, Istituto Gemmologico Italiano provides professional services within the jewellery sector. The organisation participates in the VicenzaOro trade show held in Vicenza.
VicenzaOro exhibitorVicenza · Assayer
Based in Vicenza, Italy, Labigem operates as a gemmological laboratory providing professional analysis services. The company employs advanced technical methods to examine stones and jewellery. It regularly displays its e
VicenzaOro exhibitorHong Kong · Diamond Dealer
Harsh Universal (HK) Limited is a Hong Kong-based company specialising in loose natural diamonds, including fancy colour and fancy cut varieties. The business also offers wedding bands, diamond jewellery, and appraisal s
JCK Las Vegas exhibitorBelgium · Assayer
The International Gemological Institute is based in Belgium and operates as a laboratory for the assessment of precious stones. The organisation provides grading reports and certification services for diamonds and variou
VicenzaOro exhibitor
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FAQ
Questions, answered
How many assayers does JewIQ list?
JewIQ lists 8 as of Oct 2026, ranked by profile completeness and trade-show presence. 6 have a confirmed street address.
Which countries have the most assayers?
Italy (3), United States (2) and Belgium (1). Open any of them above to see their listings.
Which assayers exhibit at trade shows?
5 exhibit at VicenzaOro, 3 at JCK Las Vegas. Each profile shows the shows and associations it is listed in.
Where does this information come from?
From public trade-show exhibitor and member directories (JCK Las Vegas, JIS, VicenzaOro and HKJMA), plus each company’s own website. Every profile shows its sources.
Is my business listed here? How do I update it?
Open your profile and choose "Claim this listing". Verification with an email on your company domain is the fastest route, and claiming is free.