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A style of cutting a diamond in the form of two diamonds that are rose cut and placed base to base, so that it is faceted as a dome on both sides. It is an old cut, found on the Florentine Diamond and the Sancy Diamond. It was used in the 19th and early 20th centuries for a pendant or for ear-rings. A diamond so cut is sometimes called a 'double rosette'
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson