A fancy intense blue diamond was the star of Bonhams’ Fine Jewellery sale in London on September 20. The rare piece, which has been held in a private collection for nearly 30 years, sold for £2,685,000 (around US$3.6 million).
The pear-shaped diamond, weighing 4.03 carats, was widely admired by potential buyers around the globe and became the subject of a fierce bidding frenzy before it finally went under the hammer, selling to Graff Diamonds for US$853,203 price per carat, according to Bonhams.
Another top lot was a fancy coloured mid-20th century diamond brooch, which was snapped up for £725,000 (around US$969,687).
The brooch comprised a total of four fancy coloured diamonds: A square step-cut fancy grey-blue diamond, weighing 4.83 carats, two fancy dark brown-greenish yellow step-cut diamonds, weighing 2.51 carats and 2.38 carats respectively, and a pear-shaped fancy pink diamond, weighing 1.90 carats.
The second-highest value lot sold was a Kashmir sapphire single-stone ring, weighing 9.61 carats. The octagonal step-cut sapphire has no indications of heating and went under the hammer for £845,000 (around US$1.13 million), equating to a $112,600 price per carat.
Jean Ghika, head of Jewellery at Bonhams UK and Europe, commented, “Our top lots performed extremely well with global buyers vying for the prize lots. The blue diamond and Kashmir sapphire both achieved strong hammer prices, demonstrating discerning collectors will always seek out the best examples when it comes to fine gemstones."