15.42ct PICTURESQUE GEM!!! 100% GENUINE Natural Sapphire FIRE GOLDEN 6 RAYS BLACK STAR - THAILAND
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Product information
Discreet item
15.42ct PICTURESQUE GEM!!! 100% GENUINE Natural Sapphire
FIRE GOLDEN 6 RAYS BLACK STAR - BLACK/ Brown - THAILAND
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Star sapphire is rare variety of sapphire that exhibits a rare asterism under specific lighting. When viewing star sapphire, a six-rayed star will appear to float across the surface of the stone. The effect is best viewed under a direct light source and while tilting and rotating the stone from different angles. Star sapphires contain unusual tiny needle-like inclusions of rutile. Aligned needles that intersect each other at varying angles produce the rare phenomenon known as asterism. Star sapphires can range in color from blue in various tones to pink, orange, yellow, green, lavender, gray or black. The most desirable color is a vivid, intense blue. Most star sapphire exhibits a white star, but star sapphire from Thailand is famed for its gold colored asterism.
Sapphire is a member of the corundum family and is closely related to ruby; the red to pink-red gem-quality variety of corundum. All corundum has a hardness rating of 9, making it the second hardest material on earth, second only to diamond. The name 'corundum' comes from the Sanskrit word 'kuruvindam', meaning 'ruby sapphire', while the term 'sapphire' is derived from the Persian word 'safir', which originates from the Greek word for 'blue'.
Star sapphire can be distinguished from other forms of sapphire by its unique asterism. The six-rayed-star effect appears most clearly under natural light, but it can also be viewed using a strong source of direct light such as a penlight or a halogen bulb. It has no distinct cleavage and has a hardness rating of 9 on the Mohs scale. Chemically, star sapphire is an aluminum oxide and forms as trigonal crystals. Owing to star sapphire's superior hardness and durability, it's nearly unmistakable, despite several other gem types that are known to occur with similar colors and luster. Some commonly confused gems include star garnet and star diopside.
PICTURE IS ENLARGED
Gem Type: PICTURESQUE GEM!!! 100% GENUINE AA+ Natural Sapphire
Shape: Oval Cabochon
Quantity: 1
Total Weight: 15.42cts
Colour: BLACK / Brown - 6 Rays Star (It will show visible star under flash light or sunlight)
Size: 16x13.7x6.2mm
Treatment: Diffusion Treated
Origin: THAILAND
Hardness: 9 MOH'S SCALE