Pearl size
The size of the oyster directly affects the size of the pearl it creates. Larger mollusks create larger pearls. However, it's more likely that a larger pearl will also exhibit more surface defects.
Large cultured pearls require a larger nucleus to be implanted into the oyster, increaseing the chance of the mollusk either rejecting the nucleus or dying before a pearl has an opportunity to develop.
Round pearls are measured according to their diameter, while baroque pearls are measured by their length and width. Pearl size is determined by diameter and measured in millimeters.
Pearl size doesn't necessarily indicate its quality, but it does affect its price. All things considered, the larger the pearl, the higher its value.
Here are some average size ranges for different types of pearls:
Akoya pearls: 6 - 8 millimeters
Freshwaterpearls: 5 - 6.5 millimeters
South Sea pearls: 11 - 13 millimeters
Tahitian pearls: 11 - 12 millimeters
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