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Large Diamond comes to Auction

Featuring in Grand Auctions’ 8 June sale will be an exceptional diamond brooch with an estimated total diamond weight of 11.39 carats. It is set with a large cushion cut diamond to the centre which weighs 5.90 cts. The size and high colour grade of this diamond is what makes the brooch so special and a great deal of interest is expected on the day.

AnchorCert Certificate

The main stone has been independently certified by the AnchorCert laboratory in Birmingham who have awarded the stone an F grade for colour. F colour is only two grades from the highest, most colourless grade possible - D colour. Grades D, E and F are only assigned to colourless diamonds. The clarity grade given is I1 which, being towards the end of the scale, does seem a little harsh in this instance. Until magnification is used to view the stone, it does appear to be of much higher clarity. Inside the stone are a multitude of tiny, black mineral inclusions which, to the naked eye, are quite difficult to spot. They do not interfere heavily with the overall colour and beauty of the diamond but, at the end of the day, must be taken into account when grading. This is, in fact, one of the best 'I' clarity stones we have seen!

11.39 carats total

Surrounding the main stone are fourteen further cushion and circular old cut diamonds ranging in size from an estimated 0.27 ct to 0.52 ct. These diamonds are of high colour and mainly high clarity. There is also a tiny rose cut diamond set into a small spike protruding from one end of the brooch. These additional stones bring the total estimated diamond weight of the piece up to almost 11.50 cts. To the reverse is a later, gold pin along with a chain and safety pin. It is thought that this gem was once part of a much larger piece, perhaps a diamond tiara or necklace suite.

8 June Fine Arts Sale

The brooch will form part of Grand Auctions’ Fine Arts Sale commencing at 11 am on Monday 8 June. You can view the piece prior to the sale by attending one of our viewing days, details of which can be found here. For more information on the gem, or to view the full A4 diamond grading report complete with facet diagram, please contact Simon Rufus, jewellery specialist at Grand Auctions, Folkestone, Kent.


 After a great deal of telephone interest, the brooch sold to a London dealer for a healthy mid-estimate £19,000 hammer.