Dazzling diamonds, Kashmir sapphires, Colombian emeralds and signed jewellery pieces are expected to command attention at Bonhams’ New York Fine Jewellery sale slated on September 19. 

A total of 180 lots are set to go under the hammer, with a 16.90-carat diamond ring leading the auction. The ring, estimated to cost US$1.6 million to US$2.2 million, features a D-colour, internally flawless, Type IIA gem. 

Susan Abeles, head of Jewellery at Bonhams US, commented: “This distinctive stone embodies rarity according to every criterion by which a diamond is measured: Colour, cut, clarity and transparency. Type IIA diamonds make up less than 2 percent of all natural diamonds and are extremely rare. This is a phenomenal specimen and its crystal limpid characteristics will attract clients who are searching for the finest example of a diamond to add to their jewellery collection.”

Another highlight of the sale is a sapphire and diamond ring. The oval-shaped sapphire, weighing 7.54 carats, set within a surround of round brilliant-cut diamonds, is expected to fetch between US$375,000 and US$575,000. It is accompanied by two reports stating that the sapphire is of Kashmir origin and has no indication of heat.

Other top coloured gemstone lot include an emerald and fancy colour diamond ring, with a pre-sale estimate of US$200,000 to US$300,000. 

Signed jewellery is also set to catch the eye of discerning collectors. Harry Winston, Cartier, René Lalique and David Webb are just some of the signed pieces to be featured in the sale. 

Abeles continued: “We have a really interesting sale this September, which features best in class colourless diamonds, Fancy coloured diamonds, Kashmir sapphires and some really wonderful examples of signed jewellery by world renowned houses and designers, which are always in demand.”