Sapphire and diamond necklace/brooch combination

Set with single- and brilliant-cut diamonds, the front supporting a detachable pendant set with a cabochon sapphire weighing 69.23 carats, brilliant-cut and marquise-shaped diamonds, length approximately 410mm, central motif detachable, may be worn as a brooch, one link may be worn as a bracelet, length approximately 190mm, maker's marks.

Accompanied by SSEF report no. 95823, stating that the cabochon sapphire weighing 69.23 carats, measuring 25.51 x 20.19 x 13.73mm, is of Ceylon origin, with no indications of heating. Each piece with maker's marks. Stamped 750 for 18 carat gold,mounted in yellow gold. Sapphire blue of medium strong saturation, with typical inclusions visible under close inspection. For more information on the sapphire, please refer to the SSEF report. Diamonds estimated to weigh a total of approximately 28.00 - 32.00 carats, on average H-I colour, VS-SI clarity, as gauged and graded in the mount. Small signs of wear and scratches to the mount. In very good condition. Total gross weight approximately 92 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."