A diamond necklace, by Graff. Photo: Christie's Images Ltd., 2010 Set with a heart-shaped diamond weighing 6.63 carats, to the fine link chain, mounted in platinum, adjustable length up to 44.5 cm Signed Graff, no. 3083 . Estimate CHF 300,000 - CHF 450,000...

Platinum, Ruby and Diamond Necklace, France. photo courtesy Sotheby's Set with oval and cushion-shaped rubies weighing approximately 40.00 carats, accented by round, old European-cut and baguette diamonds weighing a total of approximately 20.75 carats,...