The famous “Star of India” is the largest known example of which type of gemstone? Explained

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The famous “Star of India” is the largest known example of which type of gemstone? Explained

The magnificent Star of India is the world’s most famous example of a blue star sapphire. This greyish-blue gemstone is a variety of the mineral corundum and weighs a staggering 563.35 carats, making it roughly the size of a golf ball. Its most enchanting feature is an optical phenomenon called asterism, where tiny fibers of the mineral rutile reflect light to create a sharp, six-rayed star. Remarkably, this star is visible on both the top and the bottom of the stone’s smooth, cabochon-cut surface, a trait that is exceptionally rare for a gem of its massive scale.

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