Sapphire and diamond ring, mounted by Mauboussin

Set with an oval sapphire within a mount pavé-set with brilliant-cut diamonds, size 50 ½, indistinctly signed Monture Mauboussin, Paris and numbered, case, Mauboussin.

Stamped 750 for 18 carat gold. Indistinctly signed Monture Mauboussin, Paris, numbered A2073. Sapphire measuring approximately 13.00 x 10.80 x 9.70, estimated to weigh approximately 12.00 carats, blue of medium strong colour saturation. Gauged in mount. A few typical crystal inclusions visible under magnification, or to a unaided trained eye, minor nicks. For further information please refer to the SSEF report. Diamonds bright and lively. Slight abrasions to band consistent with wear. 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."

Accompanied by SSEF report no. 53650, stating that the sapphire is of Burmese origin, with no indications of heating.