Colour change sapphire and diamond ring

Claw-set with a cushion-shaped colour change sapphire, framed by circular-cut diamonds, size N, British hallmarks and maker's mark.

Accompanied by The Gem & Pearl Laboratory report no. 11942, stating that the colour change sapphire is of Ceylon origin, with no evidence of heat treatment, displaying blue in daylight and bluish purple in incandescent light. Stamped 750 for 18 carat gold. British hallmarks. Maker's mark. Sapphire as described above in report. Estimated total diamond weight approximately 2.00-3.00 carats, I-included clarity, several extremely chipped and abraded.
"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."

Accompanied by The Gem & Pearl Laboratory report no. 11942, stating that the sapphire is of Ceylon origin, with no evidence of heat treatment, displaying blue in daylight and bluish purple in incandescent light.