Parallel needles that intersect one another at 60 degree angles. Tiny needle like rutile (called "silk") arranged in three sets of This effect, called asterism, is caused by light reflecting off With a single light source:, such as a flashlight or bright sunlight, and the star moves across the stone as the light The star is most visible when illuminated These star sapphires are cut in a smooth domed cabochon But some newer, better quality synthetic Star gems are now on the market-see pictures below! Natural Star gems are irregular and imperfect, and the stars will be "wavy" and uneven in length and brightness. Synthetics are very inexpensive to produce and are very common! How can you tell the difference? For starters, synthetic stars will be "perfect", with very little or no irregularities and extremely sharp stars. Genuine Star Corundum (Sapphires and Rubies) are incredibly beautiful and interesting gemstones, and rare and expensive. The Star of India is a 563.35 carat (112.67 g) Star Sapphire
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