Also known as a rope, it is a necklace longer than opera-length often with an ornament (a tassel or pendant) at the end. Sautoirs were common during the Edwardian era. Found on http://www.encyclo.co.uk/local/22290
(Soh-TWAH) a long rope style necklace, often with a tassel or pendant at the end, these were popularized in the Edwardian era because Edward's Queen Alexandra often wore them.
Found on http://www.indygem.com/pages/Glossary-of-Terms.html