Natural black color cultured pearl necklace

The single strand composed of 40 cultured pearls in natural greenish black color measuring approximately 9.7 to 10.9 mm., completed by a ball clasp pavé-set with round diamonds, in 18 karat white gold, length 18½ inches. 

See GIA report stating the pearls are of natural color. The pearls are a deep gray-black shade with obvious overtones of green and aubergine. Good luster and minor to moderate blemishing. The diamonds are approximately H-I color and SI clarity 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. 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.

Accompanied by GIA report no. 16197327 stating cultured pearls, natural color.