A lock ring is the name given by archaeologists to a type of jewellery from Bronze Age Europe.

They are made from gold or bronze and are penannular, providing a slot that is thought to have been used for attaching them as earrings or as hair ornaments. Ireland was a centre of production in the British Isles though rings were made and used across the continent, notably by the Unetice culture of central Europe.

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Lock rings found at Great Orme in Wales (http://www.gtj.org.uk/item.php?lang=en&id=25863&t=1)