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October birthstone. October has two birthstones: opal and tourmaline. Opal is the traditional birthstone for October. It is believed the stone was discovered in India and given the name "upala ...
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.
Opal is considered the birthstone for people born in October. [67 ... 2014 at the Wayback Machine Accessed 19 October 2016. Opal Mineral data and specimen images ...
Dispersion: 0.017 [1]: Ultraviolet fluorescence: Pink stones; inert to very weak red to violet in long and short wave [1]: Absorption spectra: Strong narrow band at 498 nm, and almost complete absorption of red down to 640 nm in blue and green stones; red and pink stones show lines at 458 and 451 nm, as well as a broad band in the green spectrum [1]
Plus, an alternative October birthstone that increases emotional balance. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us. Sign in ...
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