Size
Pearl diameter is measured in millimeters. Generally, the larger the pearl, the more rare it is and the more valuable.

Matching
For pearl necklaces the overall look is very important, regardless of the quality of the individual pearls. The more uniform and aesthetically pleasing two or more pearls look together the more time was spent matching the pearls. This time to match pearls is reflected in the cost.

Rarity
Because pearls are not cut or polished when removed from the oyster or mussel, certain sizes, qualities and colors may from time to time be in scarce supply. Overall health of pearl growing oysters and mussels effect pearl size and quality availability.

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