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How do opals and diamonds differ?

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Opal is an amorphous form of silica that is hydrated, like glass that has water trapped between the molecules. Diamond is a huge molecule made of many carbon atoms connected by covalent bonds. read more

"Common opal" does not exhibit a "play-of-color." It is given the name "common" because it is found in many locations throughout the world. Most specimens of common opal are also "common" in appearance and do not attract commercial attention. However, some specimens of common opal are attractive, colorful and lustrous. read more

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