Bedfordshire Police has released images of jewellery taken during a burglary on Calverton Road, Luton on 23 November.
Between 10.30am and 7.30pm, the offenders searched the house and a number of high-value items were taken.
Officers are now asking any witnesses, or anyone with any information about the incident, to come forward.
Detective Constable Scott Hannam said: “This burglary took place during the day opposite a busy parade of shops, and I am keen to speak to anyone who may have seen someone acting suspiciously at the time to get in touch. In addition, we are asking people to review the images of the jewellery and contact us if they have been approached by anyone trying to sell the items.”
Anyone with any information is asked to contact DC Hannam on 101, quoting crime reference C/50559/2017 or, alternatively, contact Crimestoppers anonymously on 0800 555 111,