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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The Pearl industry has made a major effort to educate the public about cultured pearls for the last 50 years. It has been 100 years since the designation of the word "cultured" to the farmed pearl. So, why is the lab grown diamond using the designation of "cultured" to market its synthetic diamonds?
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