An Art Deco natural pearl and diamond necklace, by Cartier. Estimate $150,000 – $250,000. Photo Christie's Image Ltd 2015.

Designed as a graduated strand of fifty-six natural pearls, measuring from approximately 11.05 to 5.20 mm, joined by a marquise-cut diamond clasp, mounted in platinum, circa 1925, 18 1/2 ins. Signed Cartier

With report 78151 dated 23 January 2015 from the SSEF Swiss Gemmological Laboratories stating that the analysed properties confirm the authenticity of these saltwater natural pearls

With report 1162830476 dated 16 December 2014 from the Gemological Institute of America stating that the pearls are natural saltwater pearls. No indications of treatment

Christie's. MAGNIFICENT JEWELS, 14 April 2015, New York, Rockefeller Plaza