Black pearl (black pearl) is a hard and smooth product produced by black butterfly shell that secretes black pearl. Tahiti Island in Polynesia, Penglin Island in Cook Islands and Majushiki Island are the two main natural producing areas of black pearls.
The annual output of high-quality black pearls is estimated to be no more than 6.5438+0.5 million, of which 40% is sold through international auction every year. The particle size of most black pearls is between 9mm- 10mm, and about 60% is less than11mm.
Therefore, 1 1mm is generally regarded as the boundary of black pearls, and round black pearls above 15mm are so rare that there is no ready-made market reference price, which shows that they are expensive and rare.
In the past decades, the pearl culture in French Polynesia has been successfully developed. 1976, American Gemological Institute recognized the cultured black pearls produced in Tahiti as "cultured pearls with natural colors".