The geometric plaque of meander inspiration set throughout with circular- and square-cut and baguette diamonds, mounted in platinum,

For further information please see Hans Nadelhoffer, Cartier, Jewelers Extraordinary, Thames and Hudson, 1984, p 202-203. 

Stamped Pt 950 for platinum and numbered 02582. Diamonds estimated to weigh approximately 8.50 carats in total, generally H-I colour (a few J-K), SI clarity (some I), lively stones. Minor scratches to metal due to normal wear, commensurate with the age of the piece. 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 and to the Notice regarding import of Burmese jadeite and rubies into the US.
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."

The meander motif at the terminals of this brooch was a symbol of ancient origins associated with the cult of the sun. Cartier adapted this motif on vanity cases and other objects during the 1920s as it made an ideal border pattern. The Chinese variant had its origins in archaic bronzes and in Cartier's hands later appeared as dragon's head terminals.