Formerly in the collection of Diane Benvenuti, née Rothschild. Natural button-shaped pearl and Type IIa diamond brooch, first quarter 20th Century. Photo Sotheby's

Accompanied by SSEF report no. 53393 stating that the pearl is  natural and that the two pear-shaped diamonds are Type IIa. 

Notes: Madame Diane Benvenuti, née Rothschild (1907-1996), was the daughter of Baron Robert de Rothschild, one of the partners of banque Rothschild Frères in Paris, and Nelly Beer, a niece of German composer Giacomo Meyerbeer. Diane and her brothers and sister Alain,Cécile and Elie, spent their childhood between the hotel particulier at 23 avenue de Marigny in Paris and the château de Laversine, off Chantilly.

She was first married first to a diplomat, Anatole Muhlstein, with whom she had three daughters, and then, in 1952, to pianist and Paris Conservatoire music teacher Giuseppe Benvenuti. Concerned about what we may call now 'ecological' matters, she immensely enjoyed the gardens and private potager of her country seat, the Pavillon de Voisins, at Louveciennes, near Paris. Her quiet and constant generosity was famous. After joining the Free French Forces in 1945 as a nurse, she involved herself in the creation of Ecole Moria, a Jewish youth institution, and presented some of her husband's students with rare music instruments. A lady of great taste and enormous vitality, she will be remembered for her unfailing originality.

Sotheby's. Magnificent Jewels and Noble Jewels And A Celebration of Taste and Style, Magnificent Jewels from a Private Collection. Geneva, 12 May 2009