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Pearl Sorting & Grading

There are a few steps involved with sorting pearls.

Firstly, the pearls are sorted according to whether they can be used for the cultured pearl industry or not. Those that can be are categorised into 3 sections:
a) Unmarked pearls
b) Pearls with one major blemish
c) Pearls with more than one major blemish

A sieve is then used to separate different pearl sizes, and then graded based on the following considerations: