Amethyst and diamond pendent necklace, 1930s, composite

The detachable pendant set with a cabochon and calibré-cut amethysts, within a geometric open work plaque set with circular- and single-cut diamonds, the necklace set with similarly-cut diamonds, length approximately 420mm.

Amethyst medium purple, with typical inclusions visible on naked eye, very slight scratches to surface. Calibré-cut amethysts of varying saturations. Estimated total diamond weight approximately 7.00 - 12.00 carats, estimated colour of larger stones J-L, estimated clarity VS-SI. Chain and pendant detachable. Clasp loose, with safety chain to either side, could benefit from attention by a professional jeweller. 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."