designed as an oval ring of carved rock-crystal, to geometric shoulders of open work millegrain design set with single-cut and rose diamonds, accented with onyx cabochons, one diamond deficient, partial French assay and maker's marks, case stamped Van Cleef & Arpels.

Anon, Lady Crewe’s Jewels – Worn Constantly, 22 July 1933, p.8, Crystal Brooch, long with diamond and onyx ornament at each end

French assay marks stamped to pin and side of brooch for 18 carat gold. Partial illegible French maker's mark stamped to pin. Diamonds bright and lively with mixed colours and clarities, one small diamond deficient. Overall good condition. Case with scuffs and wear commensurate with age and wear to leather hinge.
"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."