Pearl jewellery. View of an assortment of pearl jewellery. Various necklaces, a ring (centre left) and a pendant of a necklace (upper left) are on display here. There are different coloured pearls on display here. The necklaces also contain gold beads and diamonds. Pearls are accretions of nacre (calcium carbonate) secreted by certain oysters and mussels. The presence of a foreign body (such as a parasite or a grain of sand) within the shell triggers the secretion of nacre by the mollusc's mantle. Thin layers are deposited on the irritant particle and, over several years, a pearl is formed.
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