- Addexton Company
 - Designs and manufactures equipment for cutting gemstones and other hard materials. - Colored Stone Magazine
- Features information for gemstone professionals.
- Dad's Rock Shop
- Serving the lapidary hobby, gem, and jewellery trades.
- Facet Shoppe
- Offers rough, cut, and set gemstones as well as faceting information for beginners and faceting-related computer programmes.
- FacetGems
- Offers facet rough, cabochon rough, loose gemstones, lapidary equipment, and supplies.
- GemData
- Search the databases from worldwide suppliers for gemstones, diamonds and cutting rough and see gems listed with retail/wholesale prices.
- GemEx Systems, Inc.
- Developers of an Imaging Spectrophotometer for the analysis of colour in gemstones of all types.
- Gemstone World
- Mine direct source for African and world gemstones.
- GemWorld
- Provide opals, gemstones, collector stones, synthetics, cabbing and faceting rough, lapidary equipment and supplies.
- International Lapidaries Co., Ltd.
- Producers of cut cubic zirconia, also offer precision gem cutting services for precious and semi-precious gemstones.
- Magic Loupe and Diamond Tester
- Tests for Moissanite, Russian Fake Diamonds, CZs, diamonds, White Sapphires and GGG's.
- National Gemstones
- Dealers in fine diamonds, precious stones, and collector gems.
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