Police are appealing for witnesses to a break-in at Uckfield jewellers George Moss overnight last night (Thursday December 12).
When the shop owners arrived for work at 8.40am today (Friday) they discovered the main front door had been forced.
A large amount of jewellery had been taken from the window displays and cabinets.
A Sussex Police spokesperson said: “It is thought thousands of pounds worth of jewellery has been stolen.
“We are appealing to anyone who might have seen anyone acting suspiciously or hanging around the High Street near the jewellers.
“Anyone with information is asked to phone Sussex Police on 101 or email firstname.lastname@example.org, quoting serial 295 of 13/12.”