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Purchase receipts indicated they had been acquired from the atelier’s Bond Street shop in the 1960s. Bought for £490 on September 30, 1966, was a blue enamel and diamond flower brooch designed as five blue enamel ‘petals’ with a central brilliant cut diamond ‘stamen’ and three pave diamond ‘leaves’.

Offered in its original Boucheron box with a photocopy of the receipt, it sold 60 years later for £6500.

Sold at £15,000 was a diamond ‘ribbon’ necklace set with brilliant cut stones within baguette cut links. It was not stamped but again came in its original fitted box accompanied by a photocopy of a Boucheron insurance valuation dated October 23, 1964, for £2000.