Joan Rivers made an appearance at a diamond jewellery event in Derbyshire last weekend.
According to Professional Jeweller, the American television personality was seen taking part in Find a Diamond, a game that challenges people to find a gemstone in a vat of rings.
The Chatsworth House CW Sellors' Christmas Wishes jewellery and watches display raised money for British charities including the NSPCC and the Air Ambulance.
Rivers was quoted as saying that the day was "fabulous".
Also in attendance was the Dowager Duchess of Devonshire, who was awarded a bejewelled bumble bee to honour her 90th birthday.
Another high-profile jewellery event next week will see rare pink diamond ring go under the hammer at a Sotheby's auction in a luxury Swiss hotel.
The item is estimated to be worth £17 million and is set to become the most valuable jewel ever to be bid upon.
It was first sold by famous American jeweller Harry Winston some 60 years ago.