Chiswick Auctions shines with historic Cartier jewels and brilliantly British creations.

The first Chiswick Auctions Jewellery auction of 2021 was a strong success proving the trend for jewellery at auction is still on the up. In total the auction, held on Friday the 28 May, achieved 174% sold by value and 85% sold by lot.

The star of the show was an Art Deco diamond and rock crystal Cartier brooch, formerly owned by the New York socialite Miss Augusta McCagg. Offered in their West London saleroom for a pre-sale estimate of £12,000-15,000, after competitive bidding from more than a dozen telephone bidders as well as online bidders, the lot finally sold for a £150,000 including Buyer’s Premium.


Art Deco Cartier diamond and crystal lapel brooch

Lot 189: An Art Deco diamond and rock crystal lapel brooch, by Cartier, circa 1925

Sold £150,000 (including premium)

Head of Jewellery, Sarah Duncan GG said, “This Cartier label brooch is a wonderful example of the early influence Indian art had on the jewellery being created by Cartier. Dating to circa 1925, the finely pierced setting shows Indian themes while embracing a highly monochrome colour palate, typical of early Art Deco jewellery. This combined with Cartier’s pioneering use of rock crystal, makes this a striking example from arguably the firm’s most important period of output. Extensive research into the family history and connections, compounded by the fact that this piece has never before been on the open market, made it very desirable to our international bidders.”

Miss Augusta McCagg, was born in New York in 1895 to Louis B. and Edith E. King McCagg. The family split their time between Newport, Rhode Island and New York City. Miss McCagg was related to some of the most prominent families in America including the Kings, the Fishs, the Browns and the Vanderbilts.

In 1923, she travelled with her cousin John Nicholas Brown II, dubbed by the press “The Richest Baby in America” following the death of this father when he was just 3 months old. Together they celebrated his 23rd birthday in Egypt at the Great Pyramids.

John Nicholas Brown and Augusta McCagg and party in Egypt, 1923

John Nicholas Brown and Augusta McCagg and party in Egypt, 1923. Image courtesy of Brown University


In April 1924, Augusta was one of eight bridesmaids to her relative Cornelia Vanderbilt when she wed John Francis Amherst Cecil at Biltmore, North Carolina for the society wedding of the year.


Cornelia Vanderbilt collecting her bridesmaid Augusta McCagg (centre) from the station before the wedding, 1924

Cornelia Vanderbilt collecting her bridesmaid Augusta McCagg (centre) from the station before the wedding, 1924. Image courtesy of the Library of Congress.


During the Second World War, Augusta led civilian defence and organized the ambulance service of the Newport Chapter of the American Red Cross. Later she was a member of the Newport Country Club where she won golf championships.


Augusta McCagg (far right). Image courtesy of the Life Magazine, 26 April 1943.


Augusta McCagg never married and passed away in 1965. The brooch has since been passed down through the family, now living in the UK. In total, a dozen pieces consigned by the descents were offered, including an early 20th century pocket watch by Tiffany & Co. which sold for £4,700 including Buyer’s Premium (Lot 183; estimate £1,200-1,500) and an Art Deco 3 carat diamond and sapphire ring which sold for a hammer price of £33,750 including Buyer’s Premium (Lot 188; pre-auction estimate £7,000-9,000).

The auction also featured a wide selection of the ‘Brilliantly British’. Of note was a Private London Collection from a personal friend of Wendy Ramshaw (1939-2018) which was 100% sold. The collection achieved more than 230% of its preauction total. Ramshaw who just passed away at the end of 2018 was a celebrated English jeweller who’s highly collectable works can be found at the V&A, the British Museum, the Metropolitan Museum of Art in New York and The National Museum of Modern Art in Kyoto. Highlights from this collection included two of Ramshaw’s iconic ring towers, one made of gold and diamonds which sold for £3, 250 including Buyer’s Premium, the other of silver and moonstone which achieved £2,176 including Buyer’s Premium (Lot 3, pre-auction estimate £500-700).

Lot 1: A gold and diamond ring tower by Wendy Ramshaw, 1986

Sold £3,250 (including premium)


And of course, no jewellery auction would be complete without some showstopping diamonds. We offered a selection of certified large diamonds which were all sold including:

Lot 108 A 5.47 carat step-cut diamond ring

Sold for £28,750 including Buyer’s Premium (pre-auction estimate £15,000-20,000)

Lot 97 A 4.10 carat pear-shaped Fancy Yellow diamond ring

Sold for £31,250 including Buyer’s Premium (pre-auction estimate £18,000-22,000)

Lot 92 A certified 5.75 carat pear-shaped diamond pendant

Sold for £16,250 including Buyer’s Premium (pre-auction estimate £10,000-15,000)

Lots 92, 97 and 108; illustrated unmounted



If you would like a free and confidential valuation or to discuss the market further please contact:

Sarah Duncan GG

Head of Jewellery