Sapphire and diamond bead necklace, David Webb

The four-strand necklace composed of numerous sapphire beads graduating from approximately 10.5 to 3.1 mm., enhanced with 18 rondelles set with numerous small round diamonds weighing approximately 11.50 carats, completed by a rectangular clasp centering an oval cabochon sapphire weighing approximately 8.30 carats, framed by additional round diamonds weighing approximately 2.00 carats, mounted in platinum and 18 karat white gold, length of strands 14 to 17½ inches, signed Webb. With signed pouch. 

There are 438 sapphire beads in all weighing 558.00 carats, according to invoice from Webb. The balance of the weights are rounded off from the invoice. The sapphires are a deep blue color and are semi-opaque to opaque. Diamond are approximately H-I color and VS-SI clarity. In good conditon. Signed Webb.
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.