A £10,000 reward is being offered for information that leads to the capture and prosecution of two robbers.
The two men assaulted an elderly couple in the garden of their home in Nottingham Road, Nuthall, at about 8pm on Thursday, July 11.
They stole jewellery before fleeing in a mid-blue coloured BMW.
Detective Constable Karl Aram said: “This was a brutal robbery and I want to make sure we bring the offenders to justice.”
A diamond solitaire ring and a Fendi watch were among items taken.
Crimestoppers has put forward a £10,000 reward. Anyone with any information should call 0800 555 111.