18kt yellow gold and platinum diamond ring from HYT Jewelry featuring platinum, 18kt yellow gold, floral motif, pavé-set diamonds and yellow diamonds. 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.. Includes a GIA report. This certification from the Gemological Institute of America assesses diamonds' authenticity as well as cut, colour, clarity and carat weight..