Opal is an hydrated silicum dioxide which reveals rainbow colours which change according to the angle of view. Opals exist in many colours : colorless, white, yellow, orange, red, yellowish brown, greenish, blue, gray, black and violet.
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Winged heart opal brooch, Pre Raphaelite (Arts & Crafts) tiara (1900s) and William Morris’ illustration. Opalescence is the optical property of a transparent or translucide material which gives it an aspect or a milky color with iridescent reflects like the … Continue reading