A white diamond ring by Piaget is the star of Bonhams Fine Jewellery sale at New Bond Street on 30th April.
The marquise-cut diamond, weighing 8.97 carats, has been graded as D-colour - the top colour grade for white diamonds. At VVS2, it is also of excellent clarity. The diamond has been classified by the GIA - the world's premier diamond-grading laboratory - as Type IIa, meaning it is chemically pure. Diamonds of such high quality and large size are extremely rare and the present lot is offered with an estimate of £250,000-£350,000 (US$ 410,000 - 580,000).
Another top-quality diamond in the sale is a round brilliant-cut weighing 5.00 carats which has also been graded by the GIA as D colour, VVS2 clarity, Type IIa. It carries an estimate of £120,000-180,000 (US$ 200,000-$300,000).
A dazzling Fancy Yellow diamond weighing an astonishing 24.59 carats is another of the highlights. The step-cut diamond ring is offered with estimates of £150,000-£250,000 (US$ 250,000-$410,000).
Among the fine-quality coloured gems in Bonhams' sale is a Colombian emerald ring of exceptional colour, weighing 10.49 carats, which is estimated to sell for £150,000-£200,000 (US$250,000-$410,000).
A fabulous ring set with a cushion-shaped Burmese sapphire weighing 22.18 carats, mounted between two demi-lune-shaped diamonds, is offered with estimates of £175,000-£200,000 (US$290,000–330,000).
For connoisseurs of period jewellery the sale offers a chance to own a rare "Orange Tree" brooch made by Cartier Paris in 1914. This tiny jewel – one hundred years old – exemplifies early 20th century quality and innovation.
NOTES FOR EDITORS
Bonhams, founded in 1793, is one of the world's largest auctioneers of fine art and antiques. The present company was formed by the merger in November 2001 of Bonhams & Brooks and Phillips Son & Neale. In August 2002, the company acquired Butterfields, the principal firm of auctioneers on the West Coast of America. Today, Bonhams offers more sales than any of its rivals, through two major salerooms in London: New Bond Street and Knightsbridge; and a further three in the UK regions and Scotland. Sales are also held in San Francisco, Los Angeles, Carmel, New York and Connecticut in the USA; and Germany, France, Monaco, Hong Kong and Australia. Bonhams has a worldwide network of offices and regional representatives in 25 countries offering sales advice and valuation services in 60 specialist areas. For a full listing of upcoming sales, plus details of Bonhams specialist departments go to www.bonhams.com