The Star of India, the largest known blue star sapphire in the world is now at display at the American Museum of Natural History’s Halls of Gems and Minerals in New York. The American museum will now house this extraordinary stone.
The Star of India is a 563.35-carat star sapphire and one of the largest such gems in the world. It is almost flawless and is unusual in that it has stars on both sides of the stone.
The greyish blue gem was mined in Sri Lanka. The milky quality of the stone is caused by the traces of the mineral rutile, which is also responsible for the star effect, known as asterism. The tiny fibres of the mineral, aligned in a three-fold pattern within the gem, reflect incoming light into the star pattern.