Opal (rare locality) (39.29 ct) - Spencer Opal Mine, Spencer, Clark Co., Idaho, USA More info: https://www.irocks.com/minerals/specimen/53276 Not all opals come from halfway across the world—sometimes, a true rarity is found right here in the USA. This is one of the rarest of USA origin opals, and comes from the important collection of USA-origin gemstones of Jim Houran, who spent decades scouring the country for the finest location gemstone examples that could match his exacting criteria. When