18kt yellow gold Sun Nº2 diamond and tourmaline necklace18kt yellow gold polished finish cable link chain stone pendant pear cut prong set pink tourmaline pear cut prong set green tourmaline pear cut prong set diamonds round cut bezel set diamonds adjustable fit lobster claw fastening Normal everyday use and external agents may reduce the lustre of gemstones and gold surfaces. To maintain, use specific, non abrasive products specially meant for cleaning jewellery.