Named after its owner, French socialite Mouna Ayoub, the Mouna Diamond weighs 112.53 carats. It is said to be one of the largest fancy intense yellow diamonds in the world.

Mouna Ayoub is the jet-setting Lebanese former wife of Saudi businessman Nasser Al-Rachid and the Mouna Diamond was part of the collection called Mouna Al-Ayoub.

The cushion-shaped stone is 26 mm in diameter set in a baguette-cut mount pendant by Bulgari.

She got the diamond, and some of her other jewellery auctioned, to fund work on the Bernard Tapie Phocea, a boat she had bought.

It was sold by Christie's in Geneva on November 16, 1998, and fetched $3,258,000 (about $28,773 per carat).