Sotheby's refers to it as a "sautoir with a lavalliere pendant," although I though sautoirs were typically longer than this - it's only 15 inches. Or so I thought, until I read the description more closely. The necklace was extended by a later date through the addition of a 12.5 inch extender. The extender, which is separated into three parts, is set with an additional 13 cushion-shaped and old European-cut diamonds weighing approximately 22.30 carats. You can tell by looking at the top of the piece that part of it is slightly different.
All images and info thanks to Sotheby's.
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