Amateur archaeologists with metal detectors found 990 items classified as treasure during 2012, according to figures from the British Museum.
All of the rare coins, rings and brooches contain gold or silver, and many date back more than 1,200 years.
The public reported more than 74,000 other historical items to the Portable Antiquities Scheme, which experts say has “revolutionised archaeology”.
More than 900,000 objects have been reported since it started in 1997.
The verification process takes several months, which is why the items submitted in 2012 are only being detailed now.
Neil MacGregor, Director of the British Museum said the scheme, which launched its annual report today, was “ensuring that finds found by ordinary members of the public are rewriting history.”