An important coloured diamond and diamond ring by Nsouli. Photo: Christie's Images Ltd., 2010 The square-shaped Fancy Vivid Yellow diamond weighing 13.29 carats to the pavé-set yellow diamond gallery mounted with two pear-shaped diamonds, with pavé-set...

A magnificent diamond ring, by J. Roca. photo: Christie's Images Ltd 2010 The ring composed of a cut-cornered rectangular diamond weighing 17.71 carats to the tapered baguette-cut diamond shoulders with plain hoop. Signed by J. Roca. Estimate $1,000,000...