An emerald and diamond ring, by Cartier. Photo Christie's Image Ltd 2012 Designed as a square step-cut diamond weighing approximately 4.08 carats confronting a similarly-cut emerald weighing approximately 3.59 carats, set diagonally on the diamond-set...

An unusual fancy coloured diamond, sapphire and diamond ring, circa 1950. Photo courtesy Bonhams The square step-cut fancy intense yellow diamond, weighing 2.87 carats, opposing a square step-cut sapphire, set within a striking, angular mount of baguette-cut...

An emerald and diamond ring, by Cartier. Photo Christie's Image Ltd 2012 Designed as a square step-cut diamond weighing approximately 4.08 carats confronting a similarly-cut emerald weighing approximately 3.59 carats, set diagonally on the diamond-set...

Diamond ring. Photo Sotheby's Centring on a square step-cut diamond weighing 4.45 carats, between shoulders set with brilliant-cut stones, size K, sizing band. ESTIMATE 35,000-55,000 GBP. Lot Sold: 72,050 GBP Sotheby's. Fine Jewels. Londres | 14 Dec 2011...

A fancy deep blue diamond and diamond ring The square step-cut fancy deep blue diamond, weighing 1.75 carats, within a surround set with brilliant-cut diamonds of pink hue, between tapered baguette-cut diamonds, mounted in 18k white gold and platinum,...

A 4.31 carats square step-cut diamond single-stone ring The square step-cut diamond, weighing 4.31 carats, between baguette-cut diamond shoulders, to a plain hoop, ring size K½. Sold for £10,800 Bonhams. Fine Jewellery, 4 Dec 2008. New Bond Street. Copyright...