The three men entered the address at 17:40 GMT and left at 18:25, taking necklaces, earrings, bracelets and other trinkets.
Det Con White said many of the items of jewellery had been passed down through generations of the family.
“Helpfully, a number of the pieces stolen are unique, so we are hoping that releasing these photographs will jog someone’s memory,” he said.
No arrests have been made at this stage, police added.