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Fire Opal: A Cool Stone with Lots of Heat - By: Andrew Stratton, 2009-08-06 Typically, the gemstone retains about 10% water content which makes it quite soft and delicate. They also come in a variety of colors-shades of blue, green, pink, black, white, red, yellow and orange. This stone is coveted for its play of color which is the dazzling display of color as light bounces off the spheres of silica. COMMENTS Add a comment |