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| Pearls are classified by origin, then graded by size, shape, nacre thickness, color, luster, surface clarity and matching. These qualities are not considered equal. Some factors will be weighted to give them more influence in arriving at a final grade. A very thin nacre thickness, for example, could never yield a fine quality pearl. Grading is relative to the best attainable quality for the type. For example, South Sea pearls, which grow in warmer water for longer periods of time, generally have a lower luster and more tiny blemishes than Japanese Akoya pearls that grow in colder water and for shorter periods of time. South Sea pearls are graded against each other, not by what would be expected for a similar quality Akoya pearl. | ||
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| Pearls are classified by origin, then graded by size, shape, nacre thickness, color, luster, surface clarity and matching. These qualities are not considered equal. Some factors will be weighted to give them more influence in arriving at a final grade. A very thin nacre thickness, for example, could never yield a fine quality pearl. Grading is relative to the best attainable quality for the type. For example, South Sea pearls, which grow in warmer water for longer periods of time, generally have a lower luster and more tiny blemishes than Japanese Akoya pearls that grow in colder water and for shorter periods of time. South Sea pearls are graded against each other, not by what would be expected for a similar quality Akoya pearl. | ||
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