Necklaces / Pendants by Diana Greenwood Hand made by Diana Greenwood. Features Primary Material : 18ct gold and silver Length (inches) : 18 One of a Kind : Yes Metal : 18ct gold and sterling silver Gems : faceted green tourmaline Hallmarked : Yes Cleaning InstructionsTo clean, use either foaming silver polish with the sponge that is provided (or an old toothbrush) or silver dip. (Goddard’s make both, which is widely available.) Then wash in soapy water to remove the polish, rinse thoroughly in clean water, dry with kitchen towel to avoid watermarks and leave to dry out completely somewhere warm.