Necklaces / Pendants by Yvonne Gilhooly This is a delicate and elegant necklace, perfect to compliment a little black dress in the festive season! Features Primary Material : onyx and silver Length (inches) : 16, 18 and 20 One of a Kind : No Metal : 18ct yellow gold,silver Hallmarked : No Cleaning InstructionsAs this necklace has an oxidised finish on the sterling silver, please do not use silver dip or abrade the surface. Avoid contact with perfume or body lotion etc. Remove whilst showering, swimming and sleeping.