This necklace is handmade, using reclaimed materials from vintage pieces. The heart pendant is made out of uranium glass. It's green with dark purple amethyst inclusions. The heart pendant measures 14mm. The bail and chain are silver-plated. The chain of the necklace is 18". The necklace glows bright green when exposed to a UV light or blacklight. It glows under both a 365 or a 395 light (photos were taken under a 365 light). It will come in a gift box.