14kt yellow gold Heart-pendant ruby and smoky quartz necklace14kt yellow gold polished finish bead chain heart pendant gradient effect ruby stones claw prong setting smoky quartz 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. Hallmarked in the United Kingdom at the London Assay Office.