Sapphire and diamond necklace

Of ribbon design, set with brilliant-cut diamonds, the front highlighted with pear-shaped motifs set with cushion-shaped and oval sapphires, marquise-shaped and brilliant-cut diamonds, length approximately 410mm, French assay and maker's marks. 

Accompanied by SSEF report no. 84333, stating that three sapphires (A, C, G) are of Burmese origin, six (B, D, E, F, H, I) are of Ceylon origin, all with no indications of heating. Sapphires measuring and weighing approximately: A: 13.35 x 9.20 x 5.60mm, 6.2 carats B: 14.15 x 10.60 x 5.85mm, 7.9 carats C: 14.40 x 12.50 x 5.65mm, 9.2 carats D: 15.40 x 12.65 x 7.30mm, 13 carats E: 17.90 x 12.35 x 8.85mm, 19 carats F: 16.40 x 12.50 x 8.45mm, 16 carats G: 15.20 x 13.00 x 5.85mm, 10 carats H: 14.30 x 11.30 x 6.65mm, 9.7 carats I: 12.80 x 9.05 x 5.90mm, 6.2 carats French maker's mark. French assay marks and stamped PT 900 and Or for platinum and 18 carat gold. Sapphires well matched in colour, blue of medium strong saturation, with good transparency, some typical inclusions, very few surface reaching, minor abrasions visible under 10 x magnification, for more information on the sapphires please refer to the SSEF report. Diamonds estimated to weigh a total of approximately 65.00 - 70.00 carats, on average G-J colour, VS clarity, as gauged and graded in the mount. Signs of normal wear to the metal consistent with use. In very good condition. Gross weight approximately 135 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 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."