Burglars broke into an Earls Barton house though a kitchen window.
The property in Doddington Road was broken into some time between 4.30pm and 10.30pm on Saturday, September 19.
After getting into the property, the thieves searched the house and stole jewellery.
Witnesses, or anyone who knows anything about this incident, should call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111.