Necklaces / Pendants by John Field Features Primary Material : silver Other Materials : amber, black onyx, dalmatian jasper, lapis, sea bamboo and turquoise One of a Kind : No Metal : silver Gems : amber, black onyx, dalmatian jasper, lapis, sea bamboo and turquoise Hallmarked : No Length (inches) : 17.5 Cleaning InstructionsWipe over the silver parts with a silver cloth occasionally.