A pair of rings were taken from a jewellery box by burglars who broke into a home.
Thieves forced their way through a ground floor window of the house in Main Street, Mursley, before escaping with the rings.
The incident happened between 11.15am-12.30pm on Monday, police said today.
But the burglary is most likely to have taken place around 11.30am, when the house alarm sounded.
If you have any information, contact Detective Constable Bruce Wilson on 101.
Alternatively contact Crimestoppers anonymously on 0800 555 111.