We bought a beautiful 2.30 carat natural color Montana sapphire (from the El Dorado Bar region) with your custom StarBrite™ cut back in June. There have been a few other mining operations since then but today mining activity is largely confined to hobby miners in the area. It became the highly profitable “English Mine,” which was in operation from 1899 until the 1920s. Afterwards Hoover purchased the land where the sapphires had been found from a sheepherder and later sold it to other investors. After examining the stones, their gemologist, George Frederick Kunz, sent Hoover $3,750 along with a letter stating that the stones were sapphires of unusual quality. A cigar box of Yogo sapphire pebbles he had collected was sent to Tiffany’s in New York in 1895. A gold prospector there named Jake Hoover helped make it famous. Yogo is in central Montana about 12 miles southwest of Utica. After cutting they are ready for the next step in their journey, being set in a unique piece of sapphire jewelry!Įven though most faceted Missouri River sapphires are in the one-carat range or less, they tend to be significantly larger than those in Yogo Gulch (a.k.a.
Fine quality creative gem cutting unlocks the potential for beauty that is hidden in the rough sapphires when they are mined. Two natural color Montana sapphires cut by John Dyer & Co. In order to intensify their light colors, the sapphires are commonly heat treated, but occasionally some of those with a medium tone are of natural color like the parcel of rough and the two Dyer sapphires from El Dorado Bar in the Missouri River region below. Bluish green and greenish blue are the most common hues but they may also be pink, purple, blue, green, yellow, gray and white (colorless). Sapphires from this region generally have a high clarity and various shades of pastel colors. Today several small-scale operations mine sapphire in the Missouri River area.
He stated that “my opinion is that this locality is a far more reliable source for this gem variety of corundum than any other in the United States that I have yet examined.” The first published reference to the sapphires from the Missouri River region was in 1873 in the American Journal of Science by Dr. Some of them are specifically from the El Dorado Bar deposit.
Many of John’s sapphires come from this area, which is about 15 miles north of Helena. Sapphires were first discovered in Montana in 1865 by prospectors searching for gold in the gravel bars along the upper Missouri River (Summer 2017 issue of Gems & Gemology). Photo credits: Client provided engagement and ring photos. A Montana sapphire engagement story: Demi said "I do" to Adrian in Times Square, NY when he proposed with a ring graced by a natural yellowish green Montana sapphire in our special StarBrite™ trillion cut.
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