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'.īuying Star Sapphire and Determining Star Sapphire Value Back to Top Star Sapphire Color All corundum has a hardness rating of 9, making it the second hardest material on earth, second only to diamond. Sapphire is a member of the corundum family and is closely related to ruby the red to pink-red gem-quality variety of corundum. Most star sapphire exhibits a white star, but star sapphire from Thailand is famed for its gold colored asterism. The most desirable color is a vivid, intense blue.
Star sapphires can range in color from blue in various tones to pink, orange, yellow, green, lavender, gray or black. Aligned needles that intersect each other at varying angles produce the rare phenomenon known as asterism.
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