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Search Location   All Locations California Colombo Ohio Category   All Categories Alexandrite Alexandrite Catseye Amethyst Ametrine Andalucite Apatite Apatite Cat's Eye Aquamarine Aquamarine Cat's Eye Beryl Chrysoberyl Chrysoberyl Catseye Chrysoberyl Stars Citrine Cobalt Spinel Crystals Diopside Diopside Cat's Eye Diopside Star Enstatite Fancy Cut Gems Feldspar Fibrolite Fluorite Garnet Garnet Color Change Garnet Grossular Garnet Hessonite Garnet Rhodolite Garnet Spessartine Garnet Star Garnet Tsavorite Investment Gems Iolite Konerupine Kunzite Lime Citrine Moonstone Mystic Topaz New Stock Opal Padparasha Pairs Peridot Quartz Quartz Catseye Quartz Stars Rare Gems & Minerals Ruby Ruby Star Rutile Sapphire Blue Sapphire Cats Eye Sapphire Green Sapphire Lavender Sapphire Other Sapphire Pink Sapphire Purple Sapphire White Sapphire Yellow Sapphirine Scapolite Silimanite Silimanite Catseye Sinhalite Sphene Spinel Spinel Star StarSapphire Taaffeite Topaz Topaz Catseye Tourmaline Tourmaline Chrome Tourmaline Col/Chg Zircon Actinolite Enstatite Cats Eye Padparasha Star Spinel Star Alexandrite Feldspar Peridot Spinel Cats Eye Alexandrite Catseye Fluorite Quartz Spodumene Amethyst Fluorite Color Change Quartz Catseye Star Ruby Ametrine Garnet Quartz Stars Star Sapphire Andalucite Garnet Cats Eye Quartz Rutilated Star Sapphire 12 Ray Apatite Garnet Colorless Quartz Color Enhanced Star Sapphire Twinstar Apatite Cat's Eye Garnet Color Change Quartz Lime Citrin Taaffeite Aquamarine Garnet Color Change Star Rose Quartz Star Topaz Aquamarine Cat's Eye Garnet Tsavorite Rose Quartz Cats Eye Topaz - Blue Beryl Garnet Spessartite Ruby Topaz Catseye Beryl Cats Eye Garnet Hessonite Sapphire Topaz - Mystic Bronzite Garnet Star Sapphire Cats Eye Tourmaline Chrysoberyl Iolite Sapphire Color Change Tourmaline Col/Chg Chrysoberyl Catseye Iolite Cats Eye Sapphire Fancy Colored Tourmaline Bi-Color Chrysoberyl Stars Iolite 4 Ray Star Sapphire White Tourmaline Catseye Citrine Konerupine Sapphirine Chrome Tourmaline Cobalt Spinel Konerupine Cats Eye Scapolite Zircon Danburite Kunzite Scapolite Cats Eye Zircon Cats Eye Diopside Kyanite Scapolite Star Zircon 4 Ray Star Crome Diopside Kyanite 4 Ray Star Scheelite     Diopside Cat's Eye Moonstone Serendibite     Diopside Star Moonstone Cats Eye Silimanite Catseye     Dunilite Moonstone Star Sinhalite     Enstatite Obsidian Sphene     Enstatite Star Padparasha Spinel     R.I. : 1.759-1.778 Hardness : 9.00 Chemical Comp. : AL2O 3 Density : 4.00 Crystal Group : Hexagonal Double-star Sapphires display a double star - By light reflecting off the silky crystallizations of rutile inside called asterism. Double-Stars display twin asterism –this rare feature is called Poly-Asterism , Please see Gemmological details. Double –Stars are much sought-after by Gemmological I nstitutions and Students of Gemology and are extremely rare.