Of geometric form, set with two circular-cut diamonds between two rock crystal bars, mounted in platinum,

Founded by Alphonse Fouquet around 1860, the House of Fouquet made significant contributions to the development of French jewellery, producing a number of memorable jewels in styles that evolved with the changing times. In 1895 the family business, located at 35 Avenue de l'Opéra, was taken over by Alphonse's son Georges. Focusing on jewels in the Art Nouveau style, Georges achieved great success at the 1900 Exposition U🐎niverselle in Paris where he collaborated with the Czech-born artist Alphonse Mucha. Georges also commissioned Mucha to create the new Fouquet headquarters at 6 Rue Royale, debuting in 1901. The firm continued to produce Art Nouveau jewels up until about 1914, many designed by or in collaboration with Charles Desrosiers, a former student of Symbolist artist Eugene Grasset. In 1919, Georges' son Jean joined the firm and successfully revived its style🐽, favouring the more abstract, geometric forms of Art Deco.

Mention is made of George Fouquet's contribution to the Pa♈ris Exposition Internationale des Arts Decoratifs in 1925 that included a black enamelled mask and rings of  crystal and ivory in the abstract, geometric style that reflected th𒁃e new modernism. See Hans Nadelhoffer, Cartier, Jewellers Extraordinary, p. 192.   

Numbered 23152, partly erased. The two circular-cut diamonds weighing approximately 2.75 carats each, of I-SI1 and H-VS2 quality, grading as collet-set mounting permits. Very minor chipping to the rock crystal. Overall in good condition, well preserved.
"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."