| Offers gemstone analysis software, gemological education, and gemological laboratory services. Category: Business: Consumer Goods and Services: Jewelry: Laboratories | |
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| Gubelin Gemmological Laboratories Independent service provides general information on gemstones, ongoing research and lab report... Category: Business: Consumer Goods and Services: Jewelry: Laboratories | |
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| Determination of the authenticity and country of origin of a rubies and sapphires. Offers... Category: Business: Consumer Goods and Services: Jewelry: Laboratories | |
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| American Gem Society Laboratories Provides diamond grading services featuring grading of the diamond cut. Category: Business: Consumer Goods and Services: Jewelry: Laboratories | |
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| Gemmological Association of Great Britain Offers gem grading and identification services and courses for the trade and members. Category: Business: Consumer Goods and Services: Jewelry: Laboratories | |
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