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Brilliant, beautiful and highly prized, the Yogo sapphire is the most precious gemstone mined in the United States and is an official gemstone of Montana. Breathtaking to behold, the Yogo sapphire is found only in Montana.

Yogos are unique among the sapphires Tiffany Jewellery Outlet    of the world. Whereas most of the sapphires found around the world vary greatly in color and quality, the Yogo sapphire unusual blue color is natural (rather than heat treated) and color and clarity are uniformly high. Yogos are nearly flawless. Another unusual quality of Yogo sapphires is that they retain their magnificent brilliance under artificial light. The majority of Yogo sapphires are the signature blue; however, exceptionally beautiful shades of purple are occasionally found.

Rough stones are generally quite small, flat and wafer-like in shape. The majority of the crystals or pieces of crystal discovered to date are too small to be cut. Most stones are less than 1 carat and anything over 2 carats is extremely rare. The largest crystal ever found was a 19 carat stone that in 1910 was crafted into an 8 carat gemstone. Rarer than diamonds, Yogo sapphires are coveted, exquisite, expensive jewels.

Fifty million years ago the cataclysmic geological events that crafted our great state caused rocks, buried deep beneath the earth crust, to melt into masses of molten magmas. One of these magmas, located on the northeastern side of the Little Belt Mountains of Central Montana, rose into the Madison Limestone deposit where it slowly cooled to form a lamproite dike. This gigantic dike intruded a fissure in the earth to form the world Cheap Tiffany Pendants largest deposit of gemstone quality sapphires, the Yogo Dike.

Located near the historic town of Utica, Montana, in Judith Basin County, the Yoga Dike varies from 8 feet to 100 feet wide and stretches over five miles in length. Although recent geological surveys indicate sapphire reserves in the Yogo Dike at depths in excess of 7000 feet, mining to date has not gone beyond approximately 250 feet. Geologists estimate that as much as 28 million carats lie beneath this huge overburden. It is impossible to fathom the size, clarity and value of the treasure still buried.

When the magma in the Yogo Dike crystallized, atoms of oxygen and aluminum merged to form corundum, the mineralized form of aluminum oxide. The word corundum is derived from the Sanskrit, kuruvinda (Ruby). The corundum formed exquisite, perfectly shaped transparent crystals. Traces of titanium and iron within the molten magmas provide the naturally occurring rich cornflower blue colorization.

The Yogo Dike is Montana only primary corundum source. In mining terminology means that the gemstone being mined remains embedded in the rock where it was formed and that rock has not migrated Tiffany Earrings UK from its original location. When the host rock has eroded and the gems have been transported by rock slides or water to another area, the new site is called a secondary source or a placer deposit.

History of Sapphires in Montana

The discovery of sapphires in Montana was a result of the gold rush of the 1860 Thousands of prospectors, seeking the elusive mineral, converged upon the area to pan the gravel bars and stream beds. Those prospectors, with experience gained in the great California gold rush, quickly constructed wooden sluice boxes to separate the gold from the gravel. Sapphires, being heavier than the gravel, collected in the bottom of their concentrates and clogged the sluice boxes. These translucent pebbles were simply a nuisance and were quickly cast aside in their frantic search for gold.

Gem quality corundum that is not red Cheap Tiffany Necklaces  in color is called sapphire. Sapphires are white, yellow, orange, green, blue, violet and sometimes pink. The small multi-colored stones that angered early placer miners by clogging gold sluices in such places as El Dorado Bar east of Helena were considered worthless.

An old-timer named "Sapphire Collins" wandered the streets of Helena in the 1860's with a pocket full of pretty pebbles. Try as he might to convince bankers, bartenders and local merchants of the stones' value, he was rudely told that gold was the only thing from the creek they would trade for, anything else was of no merit.