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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Pink tourmaline
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Tourmaline is an important group of complex gem-quality boron silicate minerals. This fine stone can be found in a multitude of colours : “from black to bluish-black, dark brown, yellow, medium brown, blue to neon blue, lime to dark forest … Continue reading