Home Montana Yogo® Sapphires Montana Yogo® Sapphires 100% Natural: untreated, non-enhanced gems. We are offering our limited-edition, Yogo® Sapphire Pendant. 17 hand-cut sapphires embedded in white gold. Order Here Montana Yogo® Sapphires Non-heat treated/non-enhanced stones; unique for their cornflower blue appearance. Unlike any other sapphire! learn more Uniquely Natural Photo Gallery