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Citrine is a transparent variety of quartz colored yellow, golden, orange, or brownish orange by trace elements and structural defects. Natural citrine is relatively uncommon, while much commercial material is produced by heating suitable amethyst or smoky quartz. It has a hardness of 7 on the Mohs...
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Blue topaz is the blue variety of topaz, a fluorine- and aluminum-bearing silicate mineral used as a gemstone. Most blue topaz sold commercially is made by irradiating colorless topaz and then applying heat treatment, while naturally blue material is uncommon. It is used in jewelry and is recognized...
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