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Auction Highlights: Bonhams London, September 20

fancy intense blue diamond ring

Magnificent diamonds, coloured gemstones and signed jewellery set to cath the eyes at Bonhams London on the 20th of September.

A pair of Kashmir sapphires and a rare blue diamond are set to sparkle at Bonhams London as it kicks off the autumn auction season with its Fine Jewellery sale on Tuesday 20 September.

Headlining the sale is a stunning oval-cut blue diamond.  Weighing 3.81 carats, the Fancy Intense Blue diamond is accompanied by a GIA report and hails from a private British collection. It is estimated at £1,300,000-1,800,000.

fancy intense blue diamond ring

As in the words of Jean Ghika, Head of Jewellery for Bonhams UK & Europe:

“Blue diamonds are extraordinarily rare and account for only 0.004% of all diamonds mined. This particular diamond is categorised as a Fancy Intense Blue with no modifying or secondary colour.  With so few blue diamonds coming to auction we are anticipating global interest.”

An exceptional pair of late 19th century Kashmir sapphire earrings is another top lot under the hammer at the sale. The cushion-shaped sapphires weigh 8.97 and 8.93 carats and are accompanied by reports from AGL and SSEF laboratories stating that both sapphires were found to be of Kashmir origin, with no evidence of heat treatment. Estimated at £400,000-600,00, the sapphires display a saturated and a vivid blue colour.


Bonhams will also be offering a beautiful oval-cut Sri Lankan sapphire ring. Weighing 18.77 carats, the sapphire sits within a brilliant-cut diamond border, with pavé-set diamond shoulders. Accompanied by a report from SSEG confirming no indication of heating, it is estimated at £60,000-80,000.

sapphire and diamond ring


In line with the market demand for coloured stones, the sale also features an impressive Emerald and diamond cluster ring, circa 1960. At the centre of the ring is a cushion-shaped emerald weighing 12.50 carats. Accompanied by a SSEF report stating that the emerald is of Colombian origin with minor clarity enhancement (oil), the ring is estimated at £30,000-40,000.


emerald and diamond cluster ring


One of the older pieces to feature in the sale is a pair of old cut Diamond pendant earrings, circa 1830. Weighing 3.02 and 3.25 carats, the E and F colour diamonds, are accompanied by additional letters from GIA stating that each diamond has been classified as Type IIa, recognized as the most chemically pure. They are estimated at £30,000-40,000.

diamond pendent earrings


Moving on to the Art Moderne period of 1930s, Bonhams London is to offer a Ruby and diamond convertible necklace & pair of pendent earrings for sale. The elegant necklace features a geometric chain of brilliant, square and baguette diamonds (weighing 35.90 carats) alternating with single ruby cabochons.

The complementing pair of pendent earrings also convert to a pair of dress clips. With a pre-sale estimate of £100,000-150,000, the versatile suite can be worn in five different ways and is a rare surviving example of transformable jewellery from the Art Deco era.



No fine jewellery sale would be complete without white diamonds. Highlighted lots in this sale include a Diamond single-stone ring, by J. Roca. The brilliant-cut diamond, weighing 13.77 carats, sits between shoulders set with trios of graduated baguette-cut diamonds. The central diamond is I colour, VVS2 clarity, it is estimated at £180,000-250,000.



A single-stone marquise-cut diamond ring, weighing 11.00 carats, will also feature as one of the leading lots of this auction. The D colour, VS1 clarity diamond has also been classified as Type IIa and is estimated at £200,000-250,000.



Bonhams, holding the world record for an Andrew Grima creation set in December 2015, will present a wonderful example of a rare piece from the 1970s by Grima, the Anglo-Italian designer who became known as the doyen of modern jewellery design in Britain.

The gold gem-set and diamond bracelet is dated 1973 and features carved emeralds and cabochon sapphires of various sizes, mounted in 18 carat gold, interspersed with brilliant-cut diamond accents. Estimated at £12,000-18,000 it is expected to attract interest from collectors across the world.

gold gem-set and diamond bracelet andrew grima



Jean Ghika goes on saying:

In recent years we have seen a growing demand from our global collectors for top quality coloured diamonds and gemstones. We are looking forward to showcasing the blue diamond, the Kashmir sapphires, a wide selection of signed jewellery and a number of our other highlights in London, New York and Geneva during our pre-sale previews.


By Claudia Carletti. Material courtesy of Bonhams.

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