![]() ![]() Trace amounts of other elements can produce brilliant yellow, orange, green, and purple gems. Red and blue are just two of the many colors found in gem corundums. It is surprising that "impurities" can produce such wonderful results! Trace amounts of impurities determine if a gem corundum will be a brilliant red ruby or a beautiful blue sapphire. Both of these gemstones have the same chemical composition and the same mineral structure. Most people don't realize that ruby and sapphire are both gems of the mineral corundum.
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