| minerals.net | The Mineral and Gemstone Kingdom |
| galleries.com | Amethyst Galleries' Mineral Gallery |
| minsocam.org | Mineralogical Society of America |
| jvclegal.org | Jewelers Vigilance Committee |
| gagtl.ac.uk | Gemmological Association and Gem Testing Laboratory of Great Britain |
| diamonds.be | Diamond High Council |
| palagems.com | Pala International-Fine Gems |
| aigsthailand.com | The Asian Institute of Gemological Sciences |
| mineralminers.com | Mineralminers.Com : Mineral Specimens, Crystals, Gemstones, Spheres, Je |
| gemhut.com | Gem Hut |
| gemkey.com | ica.gemkey.com/ |
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