The bombé segment of blue chalcedony collet-set with an oval ruby, 5 round and oval sapphires, and old-mine and and single-cut diamonds set singly and in clusters, mounted in 18 karat gold, with retractable pendant loop, maker's mark for Groene & Darde, French assay marks.  

In addition to the Groene & Darden mark on the clip, there is another (different) workshop mark on the pin. The ruby is a bright medium slightly pinkish red and the sapphires are deep blue. Diamonds are of decorative quality. Some tarnishing to the gold areas, and one corner slightly chipped, but in good condition overall.
In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. 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. Illustrations in the catalogue may not be actual size. Prospective purchasers are reminded that, unless the catalogue description specifically states that a stone is natural, we have assumed that some form of treatment may have been used and that such treatment may not be permanent. Our presale estimates reflect this assumption.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING CONDITION OF A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF SALE PRINTED IN THE CATALOGUE.