A medium pastel blue with a touch of gray oval cuprian#539

Medium toned blue with touch of gray oval, cuprian This cuprian tourmaline is eye clean and bright, but does not have the "neon" look. It medium toned blue with a touch of gray, rather looks like Montana sapphire. It weighs 1.51 carats.

I did not buy the rough for this oval as cuprian.  It was too early in the game. Later, I did not expect this somewhat different blue, with a touch of gray, to be cuprian because it does not have the “neon” look.  It does have a nice medium toned sapphire look, rather like what I have seen from Montana.  I discovered that this was cuprian with my spectrometer.  It helped confirm that there are really two types of cuprian blues to greens, some that are neon bright and some that are not.  I don’t know why, but I expect that it involves the amount of copper and other chromphores in the tourmaline.

This oval is eye clean and with fine crystal, which is exceptional for cuprian tourmaline from Mozambique.  It also indicates that the rough was purchased early in the game, because clean rough became either too expensive or unavailable after the discovery of copper in tourmaline from Mozambique.  It weighs1.51 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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