October Birthstone

 
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Tourmaline & Opal

The October birthstones are Tourmaline and Opal. Tourmaline’s colors have many different causes. It’s generally agreed that traces of iron, and possibly titanium, induce green and blue colors. Manganese produces reds and pinks, and possibly yellows. Some pink and yellow tourmaline might owe their hues to color centers caused by radiation, which can be natural or laboratory-induced.. - Gemological Institute of America

Because opal has the colors of other gems, the Romans thought it was the most precious and powerful of all. The Bedouins believed that opals contained lightning and fell from the sky during thunderstorms. When Australia’s mines began to produce opals commercially in the 1890s, it quickly became the world’s primary source for this October birthstone... - Gemological Institute of America

Gemological Institute of America gemstone resources