A cultured pearl, diamond, gold and silver torsade, by René Boivin. Photo: Christie's Images Ltd 2013.

Designed as multiple strands of cultured pearls, joined by a patinated silver and gold sculpted apple clasp with circular-cut diamond detail, mounted in silver and gold, 1970, 15 ins., with French assay marks and maker’s mark. Work of René Boivin, designed by Juliette Moutard. Estimate:  $12,000 – $15,000

Accompanied by a letter from Françoise Cailles 

Christie's. MAGNIFICENT JEWELS. 15 October 2013. New York, Rockefeller Plaza.