Sapphire and diamond necklace/brooch

The 'V' collar composed of two rows of brilliant-cut diamonds, suspending a detachable diamond pendant set with an oval sapphire weighing 55.05 carats within a diamond border, mounted in white gold,

Stamped 750 for gold. Accompanied by GIA report stating that the sapphire shows evidence of heat treatment, without indication of origin. For further details on the sapphire please refer to the report. Eye clean sapphire with visible colour zoning, rich violetish blue hue and good colour saturation. Total diamond weight approximately 50.00 - 55. 00 carats of a bright and lively quality, G-I colour and VS clarity, some SI. The detachable pendant with a brooch fitting and hinged loop to the reverse. Safety catch to the reverse of the necklace, not visible when worn. Clasp secure, with safety catch underneath. Overall well articulated necklace, in good condition.
"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."