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GEMSTONES (13)
![]() Sapphire is a gem variety of themineralcorundum. When corundum is reddish blue to violet-blue, it is known simply as "sapphire." Corundums of any other color (except red, which isruby) are known as "fancy sapphire." On the basis of dollars spent in the United States, sapphire is the most popular blue stone and the third most popular colored stone (afteremeraldand ruby). Sapphire has aMohs hardnessof 9 and can be used in almost any type of jewelry without fear of being scratched. Sapphire was traditionally mined in Southeast Asia, India, and the island nation of Sri Lanka. Recent discoveries of sapphire in several parts of Africa are bringing beautiful stones to the market from brand-new sources. ![]() You have probably not heard of thisgembefore. Gem silica is a rare variety of greenish blue chalcedony. Small amounts are currently produced in Arizona and a few other locations. It is the rarest and the most expensive variety of chalcedony. Gem silica receives its wonderful color from small amounts of included chrysocolla orcoppercompounds. It is found in arid areas, in therocksabove copper deposits. Gem silica has aMohs hardnessof 7 and is a very tough stone. That makes it perfect for use in almost any kind of jewelry. You will probably never see gem silica in a mall jewelry store or in a department store. Gem silica is primarily used by high-end jewelry designers who are making one-of-a-kind jewelry items. At the present time (late 2015) it does not have an astronomical price. The 1.5 carat trillion-cut stone in the photo had a retail price of $179. ![]() The name " |
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53 Comments
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