Coster Diamonds
Dutch diamond polishing factory / From Wikipedia, the free encyclopedia
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Royal Coster Diamonds is the oldest, still operating, diamond polishing factory in the world, located in Amsterdam, Netherlands. Founded in 1840, they have handled a number of historical masterpieces. For example, they re-polished the Koh-i-Noor, which is mounted in the Crown of Queen Mary,[1] and the Dresden Green Diamond, held in the New Green Vault at Dresden Castle.
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