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
