Spectacular diamond ring. Photo Sotheby's

Centring on a pear-shaped diamond weighing 30.31 carats, to a stylised mount highlighted by brilliant-cut diamonds, mounted in 18 karat pink gold and silver-topped gold. Ring size: 5¾. Estimate 40,000,000 — 50,000,000 HKD - Lot sold 43,220,000 HKD

Accompanied by GIA report numbered 5101488037, dated 17 January 2011, stating that the 30.31 carat diamond is Dcolour, Internally Flawless clarity; also accompanied by diamond type classification report stating that the diamond is determined to be a Type IIa diamond. Type IIa diamonds are the most chemically pure type of diamond and often have exceptional optical transparency. Further accompanied by Gübelin report numbered 11010005, dated 11 January 2011, stating that the 30.31 carat diamond is D colour, Internally Flawless clarity; also accompanied by notes and appendix stating that the diamond is classified as a Type IIa. "Diamonds of this type, exhibiting an antique cutting style as well as superior quality, are very rare and will most certainly evoke references to the historic term of 'Golconda'."

Sotheby's. Magnificent Jewels and Jadeite. Hong Kong | 05 Oct 2011 -www.sothebys.com