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Pearl Luster

Pearl Luster is defined by the sharpness and brightness of reflections as seen on the surface of a pearl. The Gemological Institute of America classifies pearl luster into five grades.

Pearl Luster

GradeReflections/Observations
ExcellentReflections are uniformly bright and sharp.
Very GoodSlightly less defined, fairly sharp, bright reflections.
GoodReflections are not clear but still fairly bright.
FairReflections are very fuzzy and weak.
PoorReflections are non-existent or extremely weak.