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en.wikipedia.org/wiki/Yogo_sapphire

Yogo sapphires are a variety of corundum found only in Yogo Gulch, part of the Little Belt .... Location of the Yogo mine area from a 1902 USGS topographic map ..... Montana sapphires were heavily mined during World War II for industrial ...

www.americangemsociety.org/en/gemstone-map

Gemstones can be found throughout the world. Take a look at our gemstone map at AmericanGemSociety.org.

www.nationalgeographic.com/science/earth/inside-the-earth/minerals-gems

The Earth produces a dazzling variety of inorganic chemical compounds. ... While sapphires are found in a few locations around the world, these "star" sapphires ...

gemexplorer.org

GemExplorer is your compass to the greatest sources of coloured gemstones, diamonds and pearls on the planet. Have you ever wondered how far the source  ...

www.jewelinfo4u.com/important-sapphire-mines-in-the-world

Mar 8, 2016 ... Important Sapphire Mines In The World by Ritika Changrani Sapphires are beautiful stones found in myriad colors like blue, yellow, orange, ...

geology.com/gemstones/ruby-and-sapphire

Ruby and sapphire have the same chemical composition and crystal ... Red and blue are just two of the many colors found in gem corundums. .... [2] Gemstones of the World: Walter Schumann; Sterling Publishing; fifth edition; 320 ... Wall Maps - World maps, United States maps, continent maps, maps of individual states.

geology.com/gemstones/states

A wide variety of gemstones are found throughout the United States ... Did you know that Montana is the home of world-famous sapphire localities, and that ...

geology.com/gemstones/emerald

It has been the world's most popular green gemstone for over 5000 years. ... Mineral Books · Gfeller Leather Cases · Gold Books & Maps · Rock Hammers ... They are found in igneous, metamorphic, and sedimentary rocks in a small ... Today emerald, together with ruby and sapphire, form the "big three" of colored stones.

www.thenaturalsapphirecompany.com/education/sapphire-mining

Education customers about sapphire and jewelry.