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2. What is the birthstone for October? Hint: There's ... - AOL

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   Birthstone for October. Tourmaline is the modern birthstone for October.. The gem comes in a range of colors, such as pink, red, green, blue, violet and black. This is fitting since tourmaline's ...

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

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4. 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]

5. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Paraiba Tourmaline has become one of the most popular gemstones in recent times thanks to its color and is considered to be one of the important gemstones after rubies, emeralds, and sapphires according to Gübelin Gemlab. Even though it is a tourmaline, Paraiba Tourmaline is one of the most expensive gemstones. [31]

6. 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

7. 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.