Gem set and diamond necklace

The front collet-set with pear-shaped cabochon sapphires and an oval emerald, the mount pavé-set with brilliant-cut diamonds, on a cord of blue woven fabric, to a clasp of fluted design, length approximately 430mm, maker's mark.

Maker's mark. Stamped 750 for 18 carat gold. Cabochon sapphires measuring approximately 12.60 x 10.05mm and 12.65 x 10.45mm (depth non measurable), well matched in colour, with typical inclusions visible under close inspection. Emerald measuring approximately 11.35 x 8.85mm (depth non measurable), with typical inclusions. Diamonds estimate to weigh a total of approximately 5.50 - 6.50 carats, on average H-I colour, VS-SI clarity, as gauged and graded in the mount. Signs of wear to the metal commensurate with light wear. Clasp secure, safety catch. In very good condition. Gross weight approximately 90 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."