Faceted Black Agate gemstone set in a unique 18k gold plated stainless steel pendant, on a 15.5" satellite necklace chain with a 2" extender. This necklace is non-tarnish, hypoallergenic, and waterproof. Named after Ianthe - a character in John Polidori's "The Vampyre"', widely considered the first modern vampyre story.