Yogo Sapphire - Montana's "Goldilocks" Gem Yellow, pink, green, and purple corundum specimens are all sapphire (red corundum is called ruby), but the most valued varieties are deep blue. Gem dealers seek cornflower blue, nearly a reflection of Montana’s Big Sky.
Montana History People & Place "The Near Perfection of Ugliness": Restoring Mary MacLane's Home in Butte, America