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Opal is a hardened silica gel, usually containing between 5-10% water. Therefore it is noncrystalline, unlike most other gemstones. There are two variety: precious opal, which shows flashes of color or iridescence, depending on the angle of viewing and light; then there is common opal whish is often opaque and displays no iridescence. The iridescence of precious opal is caused by the way the structure, or regular arrangement of tiny silica spheres, diffracts light.

Precious opals occur in a great range of color and varieties. White opal, black opal, fire opal, matrix opal, blue opal, Peruvian blue opal, pink opal…this list is extensive.