New York: The son of an Italian senator is taking Christie's to court in New York on Wednesday over the sale of one of the world's most expensive diamonds, which he claims was stolen from his family.

Amedeo Angiolillo, who lives in New York, argues that the auction house proceeded with the sale of the $40 million ($57.9 million) gem despite his raising concerns about its provenance. The Princie Diamond, as it is known, was bought by a member of the Qatari royal family.

Christie's, however, insists that the family members have no proof the diamond belongs to them and, furthermore, their client - who bought it from another family member - had every right to sell the stone.

The story began 300 years ago, when the 34-carat pink diamond was first recorded, in India. It came from the famed Golconda mines near Hyderabad, 640 km east of Mumbai. The diamond was from a fine "family" - other celebrated Golconda stones include the Agra Diamond, the Hope Diamond at the Smithsonian, and the Koh-i-Noor, which forms part of the Crown Jewels.