A rare coloured diamond and diamond ring, by Harry Winston. Photo Christie's Image Ltd 2014 Set with a rectangular-shaped orangy pink diamond weighing 12.93 carats, to the marquise-cut diamond shoulders, mounted in platinum, ring size 4½. Signed and with...

A rare coloured diamond ring and diamond ring, by Harry Winston. Photo Christie's Image Ltd 2014 Set with a rectangular-shaped orangy pink diamond weighing 12.93 carats, to the marquise-cut diamond shoulders, mounted in platinum, ring size 4½. Signed...

A rectangular-shaped diamond single-stone ring The rectangular-shaped diamond to the decorated shoulders and gallery mounted with single-cut diamonds, circa 1920. Estimate £20,000 - £30,000 ($31,660 - $47,490) Christie's. Jewellery. 10 June 2009. London,...