Coster_Diamonds
Coster Diamonds
Dutch diamond polishing factory
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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