18kt yellow gold 0.46ct round brilliant cut diamond butterfly fastening for pierced ears Includes a GIA report. This certification from the Gemological Institute of America assesses diamonds' authenticity as well as cut, colour, clarity and carat weight. These earrings come as a pair. 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.