14kt yellow gold laboratory-grown diamonds totalling 15 carats F/VS diamonds colour and clarity clasp fastening laboratory-grown diamonds 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.