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pearl_(gem)

📅 Updated:2016-05-30
🕒 Created:2016-04-22
🆔 ID:11007

Description

A pearl is a hard object made up of concentric layers of crystalline calcium carbonate, which is formed within the mantle of shelled mollusks.
Due to it's iridescent lustre, it is regarded as a gemstone and usually used in jewelry.