Burglars entered a property in Beeford and stole jewellery after smashing the conservatory window with a plant holder.
The property, in Skipsea Road, Beeford also had a purse taken from it while the occupants were out for the day, on Tuesday 25 June.
The offence is thought to have taken place just after 1pm, and a neighbour witnessed two males running away on foot into the field behind the property.
Police are appealing for further witnesses who may have seen the two males getting into a vehicle on the A165 near Beeford on the day in question. Contact Humberside Police on 101 quoting crime reference 1982330.