These Chrome Tourmalines have a special kind of color change phenomenon known as the Usambara Effect. In florescent light these gems show a green or dark green color, and in incandescent light they turn to a red, orangey-red or brownish-red color. Under incandescent light, many times thinner parts of the gem will appear green and thicker parts will appear red.
This effect is named after the beautiful Usambara Mountains which lie at the southern end of the Umba Valley, Tanzania. The phenomenon was first observed with Chrome Tourmalines found in this area.
Like all Chrome Tourmalines, the trace elements vanadium and chromium are responsible for their color. The gems actually turn pink to pinkish-red under the Chelsea filter!
Tourmaline is one of the birthstones for October and celebrates the 8th Anniversary. Lots of choice in colors for October birthdays!
We have many more shapes and sizes available in Chrome Tourmaline – please contact us if you don’t find what you are looking for in our online inventory. To learn more about Chrome Tourmaline click here.
Type: Single stone
Treatment: N Natural: No modification or enhancement
Origin: East Africa
Stock # CT349
