The Ceres collection of cameo and intaglio rings has sold for £300,000 ($489,150) at Bonhams London, a 200% increase on its £100,000 ($163,050) estimate.
It consists of 101 pieces, some of which date to the 4th century BC.
The highlight was a red garnet intaglio ring displaying a profile of Roman leader Marcus Aurelius. It made £31,250 ($50,953), beating a valuation of £1,500 ($2,445) by 1,983%.
Emily Barber, director of jewellery at Bonhams London commented: "The Ceres Collection is probably the most significant collection of cameos and intaglios to be seen on the market for several generations.
"The strong selling prices achieved accentuate just how rare it is for collections of this type to come up for auction."
Please sign up to our free newsletter to receive exciting news about jewellery auctions.