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A golden-green precious stone, mentioned in the New Testament (Revelation 21:20) as one of the precious stones in the wall of the New Jerusalem, perhaps a variety of beryl; in the Middle Ages, believed to have the faculty of shining in the dark. Now, an apple-green variety of chalcedony containing nickel, used as a gemstone.

The word is recorded from Middle English, and comes via Old French and Latin from Greek khrusoprasos, from khrusos ‘gold’ + prason ‘leek’.

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