Pearl Gemstones and Jewelry

Like amber, a pearl is an organic material and not a mineral. Pearl is produced by the tissue of a mollusk. Chemically, it is calcium carbonate, CaCO3. It is soft, with a hardness of around 2.5 to 4.5 on the Mohs scale. Some types of pearls display fluorescence when exposed to ultraviolet light, but many do not. Citation

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