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...

An important oval-shaped diamond ring. Photo: Christie's Images Ltd., 2010 Set with an oval-shaped diamond weighing 20.54 carats, to the triangular-shaped diamond shoulders, mounted in platinum, size 6 - Estimate CHF1,800,000 - CHF2,500,000 ($1,850,802...

An oval-shaped Fancy Vivid Purplish Pink diamond and diamond ring The oval-shaped Fancy Vivid Purplish Pink diamond weighing 1.53 carats to the marquise-cut diamond double tiered surround and plain hoop, ring size 6½. Est. $60,000 - $80,000. Lot sold...