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Yogo sapphires were ultimately traced from the alluvium to their source. [31] In February 1896, a sheepherder named Jim Ettien found the sapphire mother lode: the Yogo dike. [21] [61] [62] Ettien was prospecting for gold, and found sapphires after washing gravel he found in a fissure within a limestone outcrop. [44] Ettien staked two claims.
The sapphires, called Yogo sapphires as they are mined near Yogo Creek, occur in a formation three miles (4.8 km) long and eight feet (2.4 m) across. [ 1 ] The mountains are named for a butte in the range, Belt Butte, itself named for a band of white rock which encircles it.
Yogo sapphires are a variety of corundum found only in Yogo Gulch, Montana, part of the Little Belt Mountains in Judith Basin County, on land once inhabited by the Piegan Blackfeet people. Yogos are typically cornflower blue in color, a result of their containing trace amounts of iron and titanium .
An uncut, rough yellow sapphire found at the Spokane Sapphire Mine near Helena, Montana. Sapphire is one of the two gem-varieties of corundum, the other being ruby (defined as corundum in a shade of red). Although blue is the best-known sapphire color, it occurs in other colors, including gray and black, and also can be colorless.
In 2016, jeweler Olivia Young of Ouroboros sold a red spinel ring for £6,000 ($7,700). Last year, the client’s insurance company paid out £30,000 ($38,400) to replace it.
Yogo sapphires are a variety of corundum found only in Yogo Gulch, Montana, part of the Little Belt Mountains in Judith Basin County, on land once inhabited by the Piegan Blackfeet people. Yogos are typically cornflower blue in color, a result of their containing trace amounts of iron and titanium .
National Museum of Natural History, Washington [9] Star of Bombay: Sri Lanka 182 carats (36.4 g) Star Blue-violet National Museum of Natural History, Washington [10] Ruspoli Sapphire: 136.9 carats (27.38 g) [11] Stuart Sapphire: Sri Lanka 104 carats (20.8 g) Blue Tower of London [12] Bismarck Sapphire: Myanmar: 98.56 carats (19.712 g) Table Blue
Sapphires of gem quality are found in the region. They were first found in this region at Rock Creek near Philipsburg in 1892. Rock Creek, also known as Gem Mountain, has been the most productive site in Montana for sapphires by far, even more so than Yogo Gulch, producing over 190 million carats of sapphires [citation needed].
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