Necklaces / Pendants by John Field This necklace features an Iolite cabochon. The area around the set stone has been oxidised to emphasise the shape. The semi-precious gemstones used include Iolite, rainbow fluorite and amethyst. Designed and handmade by jewellery designers John and Dawn Field. Features Primary Material : iolite Other Materials : amethyst, rainbow fluorite and sterling silver Length (inches) : 17.5 One of a Kind : No Metal : sterling silver Gems : amethyst, iolite and rainbow fluorite Hallmarked : No Cleaning InstructionsA quick rub with a silver polishing cloth every now and then is all that is needed to keep this necklace looking clean and new.