CCTV images have been released of man wanted in connection with the smash-and-grab raid.
Using a sign from a nearby business, a burglar broke through the shutters of a jewellery shop in the Covered Market and smashed the shop's glass, stealing two rings.
It happened ar around 7pm on Tuesday December 4th last year.
Investigating officer PC Telesfora Rosec based at Cowley police station said: "We are appealing to anyone who may recognise the person in this CCTV image to get in touch, as we believe they may have vital information regarding this incident.
"If you recognise the person in this image, or you are the person, please make contact with us to help with our investigation."
Anyone with information has been asked to contact police on 101 or Crimestoppers anonymously.