A man was seen looking at the window display outside the shop on High Ousegate before entering the store and asking to look at a ring. When the sales assistant handed it over he bolted, still clutching the jewellery.
He ran towards Ouse Bridge before turning down the steps beside the Slug & Lettuce bar and on to King’s Snaith. The man was last seen turning left into Lower Friargate.
The incident happened at 1.05pm on Friday, 5 February 2016.
Anyone with information about this incident is urged to contact North Yorkshire Police on 101 and ask for Ian O’Grady.
Please quote incident number 121600 21221. You can also contact Crimestoppers anonymously on 0800 555 111.