Montana
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Montana is unique among sapphire sources for producing distinctive teal, blue-green, and bi-color sapphires that have become highly sought after in modern jewelry design. The state's main deposits include the Missouri River near Helena, Yogo Gulch, Rock Creek, and Dry Cottonwood Creek. Yogo sapphires are particularly notable for their consistent cornflower blue color that requires no heat treatment, a rarity in the sapphire world.
History
Sapphires were first discovered in Montana during the 1860s gold rush, initially discarded as worthless blue pebbles. The Yogo deposit was identified in 1895 when a cigar box of the blue stones was sent to Tiffany's, where gemologist George Frederick Kunz declared them the finest sapphires ever found in the US.
Notable Gems
Sapphire