Lot 234. The property of Madame Hélène Rochas. A diamond 'tranche' bangle, by René Boivin. Estimate CHF 100,000 - CHF 150,000. Price realised CHF 185,000. Photo Christie's Image Ltd 2013

Designed as a tapered platinum band decorated with an oval-shaped pavé-set diamond panel, 1930s, inner diameter 5.0 cm, with French assay mark for platinum.With maker’s mark for René Boivin. 

Christie's. MAGNIFICENT JEWELS. 12 November 2013. Geneva