Burglars took a gold sovereign on a gold chain and an antique pearl necklace after breaking into a house on Main Road through the conservatory.
The sovereign coin sits between bevelled glass, which is cracked and is more than 180 years old.
Offenders took a pearl necklace with a silver clasp and a silver ring inset with a single large pearl, as well as cash.
The burglary happened sometime between 6pm and 9pm on Monday, August 24.
Anyone with information should call DC Mark Woodcock on 101, quoting crime reference number 36308/15, or Crimestoppers on 0800 555 111.