Yellow diamond brooch resembling Queen Elizabeth's up for auction

GENEVA (Reuters) - A golden-hued diamond brooch, similar to one worn by the late Queen Elizabeth, is expected to be sold for around $6 million at a Sotheby's auction in Geneva this week.

The "Allnatt" diamond, bearing the name of its first owner, a British sportsman, is a rare stone, fancy vivid yellow in colour and weighing 101.29 carats.

It was mounted by Cartier into a floral design strongly resembling Queen Elizabeth's Williamson Pink diamond, given to her as a wedding gift in 1947.

An unmounted, internally flawless diamond weighing over 37 carats will also come up for sale at the same auction on Tuesday, Sotheby's said.

(Reporting by Denis Balibouse and Cecile Mantonavi; Writing by Emma Farge; Editing by Bernadette Baum)