14kt yellow gold Premier Amigos sapphire and diamond earrings from ADINA REYTER featuring 14kt yellow gold, pear cut diamonds, pear cut sapphires, post-back fastening, for pierced ears and stud design. 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..