Cuprian, medium toned, shift blue green round.#138

Cuprian, Included medium pastel blue green round. #138 This standard round brilliant has enough light inclusions to make its crystal poorer quality. It is still a flashy, blue green gemstone because of its completely open moderate tone level. It weighs 4.95 carats.

The top grade cuprian tourmaline that came out of Mozambique can be much larger and cleaner than the vast majority of Paraiba material from Brazil.  But in both deposit, included material represented the vast majority of the production.   I lowered my standards on cleanliness very early in the race to get as much of the different colors coming out of Mozambique  as I could get.  This was all happening long before copper in gem quality tourmaline was discovered there.  After copper was discover in samples I sent the GIA, the cuprian tourmaline with all its wonderful colors became so expensive that I was back to buying material that was even more included, with a notable exception.

This rather different round was purchased before cuprian had been discovered in Mozambique.  Its color shifts between green and blue.  It is filled with a significant number of light inclusions that add up to poorer crystal quality.  Still it has decent flash and is not dichroic that I can see.  I think it is different in a very  crowed area of the tourmaline color world, blue to green, even if it didn’t have copper.  It weighs 4.95 carats and is a standard round brilliant. I almost forgot to mention that I discovered its cuprian nature with my spectrometer.

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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