Symmetry refers to variations in a diamond's symmetry. The small variations can include misalignment of facets or facets that fail to point correctly to the girdle (this misalignment is completely undetectable to the naked eye). Symmetry is regarded as an indicator of the quality of as diamond's cut; it is graded as Ideal, Excellent, Very Good, Good, Fair or Poor. Especially with some special shaped diamonds, it is very important to cut a well-balanced symmetrical shape, for example to obtain a diamond shaped heart.

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