diamond and amethyst festoon necklace

A delicate festoon necklace with oval and round amethysts set in gold alternated with old cut diamonds set in silver, three elements of larger amethysts with a rose cut diamond entourage under which a diamond and an amethyst drop in between the elements are two loops, circa 1820, England.

weight: 21.2 grams
length: 37 (and elongated with a modern chain 44) cm.