There isn't a simple answer to this question. There are many factors that determine how long a pearl must grow in a mollusk.
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There was a question about natural Blue Akoya Pearls that came to the Cultured Pearl Association of America last week. I thought I would pass on this information because I have a Blue Akoya Pearl and Aquaprase necklace in this email. The question was, how rare are they and what gives them their intense color?...
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