It was a reliquary (kind of locket thing to hold religious artefact in). In Billericay.. not too far from us. Makes me want to dig up the back garden. If we weren't in flats, I would.

too lazy to make blue clicky

http://www.parentdish.co.uk/2010/11/18/three-year-old-finds-%C2%A32-5m-treasure-with-metal-detector/

pic of the reliquary

http://www.thisismoney.co.uk/news/article.html?in_article_id=518383&in_page_id=2