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October birthstone. October has two birthstones: opal and tourmaline. ... Birthstone for October. Tourmaline is the modern birthstone for October. The gem comes in a range of colors, such as pink ...
In 1912, to standardize birthstones, the (American) National Association of Jewelers (now called Jewelers of America) met in Kansas and officially adopted a list. [1]: 317 The Jewelry Industry Council of America updated the list in 1952 [3]: 311 by adding Alexandrite for June, citrine for November and pink tourmaline for October.
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]
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The calendula An opal armband. Opal is the birthstone for October. Cut tourmaline. October's birthstones are the tourmaline and opal. [2] Its birth flower is the calendula. [3] The zodiac signs are Libra (until October 22) and Scorpio (from October 23 onward). [4] [5]
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]
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