Coin pearls are a variety of cultured pearls known for their flat, coin-like shape and smooth surfaces. These pearls are prized for their unusual form, resembling small coins or discs, which sets them apart from traditional spherical pearls.
The unique shape of coin pearls is a result of their cultivation process. They are typically formed by inserting a flat nucleus into the mollusc, encouraging the growth of a pearl with a flattened profile. This intentional shaping technique produces pearls that closely resemble coins, hence their name.