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"Yogo sapphire" is the preferred term for gems found in the Yogo Gulch, whereas "Montana sapphire" generally refers to gems found in other Montana locations. [18] More gem-quality sapphires are produced in Montana than anywhere else in North America. [18] Montana sapphires come in a variety of colors, though rubies are rare. [16] [18] [23]
It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors. The only color corundum stone that the term sapphire is not used for is red, which is called a ruby. [1] Pink colored corundum may be either classified as ruby or sapphire depending on locale.
Rock Creek is a 52-mile (84 km) river in Missoula and Granite County, Montana. Rock Creek is a tributary of the Clark Fork river. The river's headwaters are in Lolo National Forest near Phillipsburg, Montana. The river roughly parallels the Sapphire Mountains and enters the Clark Fork of the Columbia River near Clinton, Montana.
John took over the laboratory and manufacturing side of the company while Tom works on the marketing end. They continue the work that their father started as a boy and after Carroll's death, the Chatham company developed its first synthetic diamond which was Carroll's dream since he was a boy that caused an explosion in his garage lab.
The company also partners with Miss Rodeo America. [10] In 2013 Montana Silversmiths partnered with Girls With Guns, a company that designs and sells hunting and outdoor clothing for women, to produce branded jewelry and belt buckles. [7] They have been named the official buckle supplier for the United States Team Penning Association for 2017 ...
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In 2012, together with his family, he established a Gemological laboratory in Bangkok called Lotus Gemology. In 2017, Lotus Gemology published Hughes' book Ruby & Sapphire: A Gemologist's Guide, [7] covering the corundum gem species. [8] [9] In 2019, Tongji University created an exhibit centering on Lotus Gemology's photography. [10]
Today, it is still regarded as the world’s largest gem-quality engraved sapphire. [3] The Millennium Sapphire was certified in its rough form by the Asian Institute of Gemological Sciences and the Gemological Institute of America. The Gubelin Lab of Switzerland recently certified the sapphire in its finished, carved form at 61,500 carats ...
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