Carved jade, onyx, seed pearl and diamond sautoir

The pendant composed of a pierced jade plaque carved with flowers and studded with small old European-cut diamonds, within an onyx frame of conforming shape, surmounted by a triangular-shaped old-mine diamond, joined to a platinum mesh necklace accented with seed pearls, onyx beads and small old European-cut diamonds, total length 24½ inches, back segment detaches to shorten to 17 inches. 

Good condition. The chain is circa 1915, the pendant appears to be a later addition. The seed pearls are silvery white; the diamonds are near colorless and decorative in quality. The translucent carved jade plaque is a medium slightly bluish green with significant white veining. Of the two clasps, one opens easily, the other is presently very stiff and might benefit from the attention of a jeweler.
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.