An Important Marquise-cut Diamond Single-Stone Ring The marquise-cut diamond weighing 8.04 carats to the plain hoop, ring size 6¼. Estimate $480,000 - $540,000 Accompanied by report 16916195 dated 17 March 2008 from the Gemological Institute of America...

A 12.98 carats diamond ring Set with a marquise-cut diamond, weighing approximately 12.98 carats, flanked on either side by a tapered baguette-cut diamond, mounted in platinum. Price Realized: $206,500 Christie's. Jewels: The New York Sale. 15 October...

A diamond solitaire ring the marquise-cut diamond, weighing 4.92 carats, with tapered baguette-cut diamond shoulders and a plain mount; mounted in platinum. Estimate: $12,000 - 15,000 (Copyright © 2002-2008 Bonhams 1793 Ltd., Images and Text All Rights...

An unmounted fancy colored diamond the old marquise-cut fancy intense yellow diamond, weighing 8.06 carats. Estimate: $80,000 - 125,000 (Copyright © 2002-2008 Bonhams 1793 Ltd., Images and Text All Rights Reserved) Bonhams. Fine Jewelry, 14 Oct 2008....