Sautoir (French). A woman's long neck chain, worn loosely from the shoulders and usually extending down to below the waist. Some have a jewelled pendant or a tassel suspended at the bottom. Although usually worn from both shoulders, it was often worn draped over only one shoulder, then said to be worn en sautoir sur l'epaule. It was popular in the 19th century.
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson