AMETHYST - PERIDOT - BLUE TOPAZ - 14K Yellow Gold Solitaire Gemstone Earrings. Genuine gemstone Solitaire Earrings, at an unbelievably affordable price!!! Two brilliant round-cut gemstones, .80 carat weight, are set in four prongs of 14K yellow gold. Secure SCREW back. Amazing! Each earring measures 5mm or 3/16 inches!