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  2. Tourmaline - Wikipedia

    en.wikipedia.org/wiki/Tourmaline

    For example, blue indicolite tourmaline is the only blue gemstone of any kind that will show a drag response when a neodymium magnet is applied. Any blue tourmaline that is diamagnetic can be identified as paraiba tourmaline colored by copper in contrast to magnetic blue tourmaline colored by iron. [22]

  3. Do You Know Your Birthstone? Here Are the Colors and Meanings ...

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  4. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    The black fire opal is the official gemstone of Nevada. Most of the precious opal is partial wood replacement. The precious opal is hosted and found in situ within a subsurface horizon or zone of bentonite, which is considered a "lode" deposit. Opals which have weathered out of the in situ deposits are alluvial and considered placer deposits.

  5. Birthstone - Wikipedia

    en.wikipedia.org/wiki/Birthstone

    A birthstone is a gemstone that represents a person's birth period, usually the month or zodiac sign. Birthstones are often worn as jewelry or a pendant necklace. History of birthstones

  6. Beryl - Wikipedia

    en.wikipedia.org/wiki/Beryl

    Emerald is a rare and valuable gemstone and, as such, it has provided the incentive for developing synthetic emeralds. Both hydrothermal [ 37 ] and flux-growth synthetics have been produced. The first commercially successful emerald synthesis process was that of Carroll Chatham. [ 38 ]

  7. Elbaite - Wikipedia

    en.wikipedia.org/wiki/Elbaite

    Elbaite is allochromatic, meaning trace amounts of impurities can tint crystals, and it can be strongly pleochroic. Every color of the rainbow may be represented by elbaite, some exhibiting multicolor zonation. Microscopic acicular inclusions in some elbaite crystals show the cat's eye effect in polished cabochons.

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