Wonder Stone or Wonder Rock is a common name for a tight graned type of Rhyolite, that is suitable for gemstone use. This rhyolite is banded and has very pleasing colors of plumb, yellow and tans.Wonder Stone is found in many locations thorough the west. (for example, Yellowstone in Wyoming, Long Valley in California, Alder, Montana and Valles in New Mexico) The Earrings are 24x11mm (.95" x .45") The pendant is 38x16mm (1.49" x .63")Chain not included.