Important ruby and diamond ring

Set with an oval ruby weighing 18.86 carats between triangular diamond shoulders, size  52^1/2, French assay and partial maker's marks.

Accompanied by SSEF report no. 76396 and Gübelin report no. 17100052, each stating that the oval ruby weighing 18.86 carats, measuring 17.27 x13.30 x 8.91mm, is of Burmese origin, with no indications of heating, each with an appendix letter. Partial French assay mark. French assay mark and stamped 750 for 18 carat gold, mounted in yellow gold. Ruby purplish red of medium strong saturation, with typical inclusions, small abrasions and nicks, minor cavities to the pavilion. For more information on the ruby, please refer to the SSEF and Gübelin reports. Diamonds bright and lively. Small scratches and signs of wear to the metal. In good condition. Gross weight approximately 9 grams.
"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.
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."