A Diamond Necklace, by René Bry. Photo Christie's Image Ltd 2014

Composed of two foliate tapered flexible bands, each centering upon a line of graduated brilliant-cut diamonds, flanked on either side with baguette-cut diamonds, to the brilliant-cut diamond surround, transform to be worn as two bracelets with additional clasp links, 1950s, necklace inner circumference 32.8 cm, with French assay marks for platinum and gold With maker’s mark for René Bry – Estimate: CHF400,000 – CHF500,000 ($453,477 – $566,847)

Christie's. GENEVA MAGNIFICENT JEWELS.14 May 2014. Geneva