All opal diamonds are made of silicon dioxide and water. The amount of water varies and determines the fragility of the individual stone. This gemstone is formed when silicon dioxide becomes wet and turns to a gel. This gel substance then works its way into the open spaces between rocks and caves. As it sets, an opal is formed.
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.
The fire opal is one gemstone that is less desired for its play of color as it is for its actual color. As the name implies, this stone is afire with reds, yellows and oranges. Finding a fire opal pendant with hot shades as well as play of color offers the best of both worlds.
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