
Gemstones are divided into different categories, types and varieties. For example, is a ruby corundum of various types, while the rest of the color of sapphire is corundum. Emerald (green), aquamarine (blue), bixbite (red), goshenite (colorless), heliodor (yellow) and Morganite (pink) are all varieties of minerals types of beryl.
Gemstones are characterized by the refractive index, dispersion, the specific weight, hardness, cleavage, fracture, and the gloss. It may occur pleochroism or double refraction. You can change the luminescence and absorption is distinctive frequencies.
Material or flaws within a stone may be present as inclusions. The gem may occur in certain locations, called the “occurrence.”
Semi Precious beads consisting of Amethyst, Ametrine, Apatite, Blue Topaz, Carneline, Chalcedony, Chrysoprase, Citrine, Crystal, GARNET, Gold, Stone, HessoniteIolite, Jade (Aventurine), Jasper (Red), Labradorite, Lapis, Lemon, Quartz, Mahogany, Obsidian, Melachite, Moonstone, Multi, Color, Stone, Onyx, Peridot, Picture, Jasper, Rainbow, Moonstone, Rose, Quartz, Rutilated, Smoky, Snowflack, Obsidian, Sodalite, Sun Stone, Tiger, Eye, Tourmaline, Unakite beads and many more.
See Dazzling Semi Precious Beads Collection at http://www.j-beads.com/gemstone-beads.html
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