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Diamond refers to the diamond or other gemstone with many facets cut in a specific form to have extraordinary luster. The shape is similar to a cone and provides maximum light return through the top of the diamond.

Even with modern technology, cutting and polishing of diamond crystals always results in a sharp reduction in weight. Rarely less than 50%. When the crystal is octahedral, round bright cutting is preferred, because usually two gemstones can be cut from one such crystal. Bizarre crystals (such as emerald) are more likely to be cut by fancy cutting (i.e. cutting different from round bright cutting), and this special crystal shape is suitable for this kind of cutting.