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HOW TO SPOT A FAKE BLUE STAR SAPPHIRE?

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BLUE STAR SAPHIRE sometimes displays a three-ray, six-point star. These star sapphires are cut in a smooth domed cabochon cut to display the effect. The star is best visible when illuminated with a single light source: it moves across the stone as the light moves. This effect, called asterism, is caused by light reflecting off tiny needle like rutile (called "silk") arranged in three sets of parallel needles that intersect one another at 60 angles. Star Sapphire is usually found in Blue colors, but there are also various shades of brown and green that are called Black Star Sapphire. Orange and Yellow Star Sapphires are almost unknown, and very rare. Color Changing Star Sapphires are even more of a rarity. The value of star sapphires are influenced by at least these two things: 1) the intensity and attractiveness of the body color, and 2) the strength and sharpness of the star. Of course all six legs should be fairly straight and equally prominent. Star sapphires rarely have the ... more
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