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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]
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]
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.
A gemstone that has been rising in popularity is Cuprian Elbaite Tourmaline which is also called "Paraiba Tourmaline". It was first discovered in the late 1980s in Paraíba, Brazil and later in Mozambique and Nigeria. [30] It is famous for its glowing neon blue color.
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