Where Colored Diamonds Come From And How They Are Named - By: Gregg Hall, 2009-01-13

Natural stones can be treated and cleaned with a high heat system called irradiation and other stones are painted to raise value. Many people like stones to have no color and consider them to be more of value but others enjoy the bright colors in their stones. Most colored diamonds are mined that way naturally. Some may turn green from heat and radiation others from nitrogen causing yellow stones.

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