Onyx and diamond brooch, Cartier, circa 1915

The plaque with calibré-cut and buff-topped onyx in a palmette design, highlighted with circular- and single-cut diamonds, mounted in platinum, signed Cartier London, Paris, New York and numbered,  case.

Cf: Hans Nadelhoffer, Cartier Jewellers Extraordinary, 1984, plates 24 and 25 for examples of other onyx and diamond set jewels by Cartier in the early 20th Century.

Numbered 6398. Diamonds estimated to weigh approximately 4.00 carats in total, generally H-I colour, VS-SI clarity, the largest diamond estimated to weigh approximately 0.70 carats, I colour, I clarity. Onyx dark brown to black, with some minor scratches, nicks and abrasion. A few of the small carved onyx have been later replaced. Minor marks of glue at the back of some onyx. Normal signs of wear, commensurate with age. 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."