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The cutter decides what shape the diamond will be. He takes into consideration the shape of the rough, its size, inclusions and how much weight will be lost in the cutting. The most popular shape for the engagement diamond is the round brilliant cut. This is usually cut from an eight-sided crystal. The marquise, oval, pear, emerald and heart-shaped diamonds are known as fancy cuts. These are all fashioned from different shapes of rough diamonds. The shapes of the facets differ in each of the cuts and these tiny polished planes of the surface of each diamond account for its brilliance and fire.
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