Diamond brooch, Cartier, 1937

Of geometric design, set with brilliant-cut and baguette diamonds, signed Cartier, numbered, import mark, fitted case stamped Cartier.

Cartier London, February 1939.
Sotheby's, 10th July 1986, lot 145.

Accompanied by a facsimile of a letter from Cartier London, dated 3rd February 1989. Stamped PT 950 for platinum, signed Cartier London, import mark JC to lower edge. Clip fitting numbered 8471, stamped OR for gold. Diamonds bright and lively, estimated to be H-I colour, VS clarity on average, some SI clarity, estimated total diamond weight approximately 7.00-9.00 carats. Overall dimensions approximately 38 x 33 x 4mm, gross weight approximately 13.6 grams. Fitted case stamped Cartier. Light scratches to metal surfaces consistent with age and wear. Pin fitting secure. in good condition.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Please note that colour, clarity and weight of gemstones are statements of opinion only and not statements of fact by Sotheby's. We do not guarantee, and are not responsible for any certificate from a gemological laboratory that may accompany the property. We do not guarantee that watches are in working order. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue, in particular to the Notice regarding the treatment and condition of gemstones.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

This brooch was purchased from Sotheby's in London on 10th July in 1986 by a close friend of Margaret Thatcher. Margaret Thatcher wore the brooch on numerous public occasions such as on the day that she offered her resignation to the Queen in 1990 and when she announced her decision to leave the House of Commons in 1991.

Accompanied by a facsimile of a letter from Cartier London, dated 3rd February 1989, stating that the brooch was made as a single piece in 1937, and originally sold in 1939. The letter also gives the owner of the brooch permission on behalf of Cartier London 'to select jewellery on approbation for the use of the Prime Minister'.

Proceeds of this lot will go to the Endeavour Fund 

In 2012, fuelled by The Duke and Duchess of Cambridge and Prince Harry’s passion for supporting the recovery of wounded, injured and sick Servicemen and women, The Royal Foundation created the Endeavour Fund. The programme offers seed funding for sporting and adventure challenges and helps those recovering from mental and physical injuries with hands-on support, mentoring and advice. Endeavour plays an important role in ensuring that more servicemen and women have the opportunity to rediscover their self-belief and fighting spirit as part of their recovery.

Since its inception, the Endeavour Fund has supported over 1,500 men and women to take the next step in their recovery by taking part in an endeavour, such as Turn to Starboard, which uses sailing to help Servicemen and women move beyond injury and Mission Motorsport, which provides opportunities for Service Personnel and Veterans to engage with Motorsport whilst providing vital training and networking into the automotive industry.

This charity is very close to the heart of the seller of this brooch.