Fantastic rhyolite stone stud earrings. The rhyolite are natural tumbled rhyolite stones. The earrings have sterling silver posts and are made with real rhyolite stones. The earrings are hand made in the USA. It comes from a smoke free environment The rhyholite stone earrings measure: 25 mm x 19 mm x 7 mm or .98 inches x .75 inches x .45 inches. Please note, because the stones are natural / genuine the earrings are not identical. While the stones are selected due to their similar shape, color and texture there are some minor differences, that are found in genuine minerals / gemstones.