Ruby and diamond ring, Marina B, circa 1980

Collet-set with a cabochon ruby between two marquise-shaped diamonds, size L^1/2, signed Marina B, numbered, French assay and partial maker's marks.

French assay mark and stamped 750 of 18 carat gold, partial maker's marks and initials MB for Marina B to exterior of shank. Interior of shank signed Marina B, numbered 151127. Ruby deep purplish-red, translucent, with typical inclusions visible to the naked eye, some surface-reaching. In closed-back setting, front measuring approximately 13.3 x 6.9mm. Diamonds bright and lively, estimated total diamond weight approximately 0.30 - 0.50 carats. Wood surface black, with stippled grain. Scratches to stone, metal and wood surfaces consistent with wear. In good condition. Band width approximately 12mm at front.
"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."

Cf: Viviane Jutheau de Witt, Marina B: the Art of Jewellery Design, Milan, 2003, pg 109, item 200, for the design drawing of a ring of identical design, set with a cabochon emerald.