Lot 126. A 3.81 carats fancy intense blue diamond ring. Sold for £2,322,500 (€2,702,938). Photo: Bonhams. LONDON - Bonhams kicks off the fine jewellery autumn season selling Kashmir sapphires, Harry Winston diamonds and signed jewellery for dazzling prices....

Emerald and Diamond necklace, J. Roca, 1970s. Photo Sotheby's Designed as a series of navette-shaped links set with brilliant-cut, pear- and marquise-shaped diamonds, accented with circular-cut and pear-shaped emeralds, length approximately 410mm, signed...

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...

A magnificent diamond ring, signed by J. Roca, composed of a cut-cornered rectangular diamond weighing 17.71 carats to the tapered baguette-cut diamond shoulders with plain hoop, Accompanied by report no. 5111816766 dated 11 March 2010 from the GIA Gemological...