This is a winged oyster, a bivalve, and one of those rare shells that produce pearls. This listing is for one single shell, half of the oyster, so you can see both the lustrous gold shell polished exterior and the nacreous interior.
Bivalve shells are so called because they are composed two, usually similar, hinged parts called valves. The earliest bivalve fossils found date to the early Cambrian period, making them more than 500 million years old.
These typically measure from 12cm to 14cm long. Colours and sizes will vary; these are natural shells and the photograph is of a typical example, not the shell you will receive. If you have any particular requests in terms of colour or size, please pop them in the notes - we’ll do our best to find the shell that comes closest to what you want!