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They also may be created synthetically in laboratories for industrial or decorative purposes in large crystal boules. Commonly, natural sapphires are cut and polished into gemstones and worn in jewelry. Pink-colored corundum may be classified either as ruby or sapphire depending on locale. Red corundum stones also occur, but are called rubies rather than sapphires. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors "parti sapphires" show two or more colors. The name sapphire is derived via the Latin "sapphirus" from the Greek "sappheiros", which referred to lapis lazuli. A sufficient and careful proper orientation for cutting star rubies and sapphires.Ī distorted bi-pyramidal star sapphire crystal from Kyauk-pyat-that, Mogok, properly oriented for cutting into star stones.Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide ( α- Al 2 O 3) with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium. Gem cutter must be precautions in order to get a well defined and proper oriented star. The cutting in star sapphires play a crucial part. The external light becomes the main reason of star by reflecting perpendicular to the rutile growth. However, the star will only be visible If rutile's grow to sufficient density in 6 different directions. During this, the structure becomes fixed.Īfter the formation or final processing of structure building in the sapphire, rutile needles grow following crystal structure while forming microscopic needles at 60 degree intervals. When a sapphire or rubies cool down from a semi liquid state, titanium dioxide present in it will crystalize after the sapphires cool down. Though being beautiful, the mysterious mechanism of internal reflection is quite simple. Chemically, star sapphire is an aluminum oxide and forms as trigonal crystals. A window into a sapphire crystal showing its trigonal crystal symmetry colorless silky center with nearly opaque blue outer growth. In cabochon form, star makes the low grade Corundum also valuable. That is due to their asterism or internal reflection. Star phenomena in rubies and sapphires is common. It gives us two beautiful varieties of precious stones those are sapphire and rubies.
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