Gemstones Home Page > Arts > Crafts > Jewelry > Gemstones >     Related categories: » Top/Science/Earth Sciences/Geology/Rocks and Minerals/Gemstone » Top/Shopping/Jewelry/Supplies/Gemstones   Refine your Search: @ Shopping   Web Sites The Opal Association All about opals, includes miners, cutters, wholesalers, retailers, exporters, collectors, hobbyists, lapidaries. http://www.opal.asn.au   The Rock Tumbling Hobby Site Step by step guide, including tips on equipment and stone selection, preparation, and polishing. http://www.rocktumblinghobby.com/     Gemstones

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