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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 Bargain Lots Beryl Chrysoberyl Chrysoberyl Catseye Chrysoberyl Stars Citrine Cobalt Spinel Crystals Diopside Diopside Cat's Eye Diopside Stars Enstatite Feldspar Fluorite Garnet Garnet Color Change Garnet Grossular Garnet Hessonite Garnet Rhodolite Garnet Spessartine Garnet Star Garnet Tsavorite Investment Gems Iolite Konerupine Kunzite Kyanite Lime Citrine Moonstone Mystic Topaz 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 Scapolite Scheelite Silimanite Silimanite Catseye Sinhalite Special Cut Gems Sphene Spinel Spinel Star StarSapphire Taaffeite Topaz Topaz Catseye Tourmaline Tourmaline Bi-Color Tourmaline Chrome Tourmaline Col/Chg Zircon       Alexandrite Enstatite Opal Scapolite Alexandrite Catseye Feldspar Padparasha Silimanite Catseye Amethyst Fluorite Peridot Sinhalite Ametrine Garnet Quartz Sphene Andalucite Garnet Color Change Quartz Catseye Spinel Apatite Garnet Grossular Quartz Stars Spinel Star Apatite Cat's Eye Garnet Hessonite Ruby Star Sapphire Aquamarine Garnet Rhodolite Ruby Star Taaffeite Aquamarine Cat's Eye Garnet Spessartine Rutile Topaz Beryl Garnet Star Sapphire Blue Topaz Catseye Chrysoberyl Garnet Tsavorite Sapphire Cats Eye Tourmaline Chrysoberyl Catseye Iolite Sapphire Green Tourmaline Bi-Color Chrysoberyl Stars Konerupine Sapphire Lavender Tourmaline Col/Chg Citrine Kunzite Sapphire Other Zircon Cobalt Spinel Kyanite Sapphire Pink     Diopside Lime Citrine Sapphire Purple     Diopside Cat's Eye Moonstone Sapphire White     Diopside Stars Mystic Topaz Sapphire Yellow       The red variety of the corundum family, ruby has been the world's most valued gemstone for thousands of years. Gemological Information Color : Red, Orangey Red, Violetish Red Refractive Index: 1.759-1.778 Chemical Composition: AL2O3 Hardness: 9 Density: 4.00 Crystal Group: Hexagonal Ocurrence: Sri Lanka, Burma, Thailand, East Africa, Vietnam, Madagascar. Fine rubies, especially Burmese stones over 3cts, are among the rarest and most expensive gemstones in the world. Prized for their beauty, durability, and rarity, it is the quality of the color which most determines the value of the stones. The ideal color is that of a traffic light -- a highly fluorescent red of high intensity. Rubies and sapphires are both members of the corundum family with the same hexagonal crystallographic structure. The basic chemical formula is AL2O3 .. the same for both ruby and sapphire. It is the presence of chromium, iron, vanadium and titanium which are responsible for the wide range of colors in which the mineral occurs. The red color in rubies is primarily a result of the presence of chromium. A red corundum is known as ruby and any other color is called a sapphire. The heating of rubies and sapphires is a widely used and accepted enhancement process which can improve the transparency and/or the color of the stones. The treatment is permanent and heated stones do not require special care.   453/1 HAVELOCK ROAD, COLOMBO 06, SRI LANKA. TEL - +94 11 4527760, 5052185, 5050232 FAX - 2588912 Email : crescent@cresla.com