Fascinating green to golden brown color changing oval.#300

Green to brownish gold color changer, oval This gemstone is unique in the collection. It changes from brownish gold in incandescent to green in natural light. It is eye clean, bright and weighs 2.92 carats.

This tourmaline is unique in the collection.  It is a color changer from golden brown in incandescent light and green in daylight.  Neither color really grabs you, but the color change is hard to miss.  I looked at the stone with my spectrometer and I believe that this is a Dravite, the species.  Dravite is a member of the tourmaline group, but it comes from a completely different geological setting, metamorphic rock while Elbaite, the more common species in gemstones comes from igneous pegmatites.  The rough probably came from the same area in East Africa where they find “chrome” tourmaline.  The gemological properties are all good and even without change color it is a bit different and attractive.  It weighs 2.92 carats.

Bruce

About Bruce Fry

I was born in Summit, NJ in 1947 and graduated from Summit High School in 1966. I graduated from the Colorado School of Mines in 1970 and after spending another year in graduate school, I left to see the world of Brazil. After spending some more time discovering myself, I ended up working for the Commonwealth of Pennsylvania for 32 years as an Air Quality Engineer in the Department of Environmental Protection. I retired in 2007 and took up faceting gemstones again after a long hiatus that reached back to my twenties. I had started cutting cabochons when I was 13 and bought my first faceting machine when I was 15, but ran out of money and time until I retired.
My great love in gemology is tourmaline and the collection presented here represents my effort to get as much beauty and variety in the colors of tourmaline as I can. I was particularly lucky in being able to get unheated cuprian tourmaline before copper was discovered in gem grade tourmaline from Mozambique.

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