platinum solitaire diamond necklace from KWIAT featuring platinum, polished finish, delicate chain, claw/prong setting and round brilliant cut diamond. Includes a GIA report. This certification from the Gemological Institute of America assesses diamonds' authenticity as well as cut, colour, clarity and carat weight.. 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..