A natural green star sapphire is a type of gemstone that exhibits a star-like phenomenon known as asterism. It is a variety of corundum, which is the same mineral family as rubies and sapphires. The green color in a green star sapphire is typically caused by traces of iron or chromium within the crystal structure. What makes star sapphires unique is the presence of intersecting needle-like inclusions that create a six-rayed star pattern on the surface of the stone when properly cut and polished. These inclusions are known as rutile needles or silk. When a star sapphire is exposed to a direct light source, such as a single point of light, it displays a distinct star-shaped reflection that moves across the surface as the stone is rotated. The value and desirability of a green star sapphire are determined by various factors, including the intensity and saturation of the green color, the clarity and visibility of the star, and the overall quality of the gem. The star should be sharp and well-centered, ideally visible under both natural and artificial light. As with any gemstone, it is essential to ensure the authenticity and quality of a green star sapphire before making a purchase. It is recommended to consult with a reputable gemologist or jeweler who can provide a professional evaluation and certification of the gem's authenticity and characteristics.
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