I did not buy the rough for this gemstone as cuprian and I did not know it was cuprian until I check it out with my spectrometer. I have no idea whether the copper content effects the color of this round, but it does make it more interesting.
The posted round, without any concerns about copper, is a beautiful gemstone. It is a determined light yellow that stays yellow. And when I had to test it under the twisted florescent light in a yellowish shade, the bright yellow rays were practically blinding. It is complete eye clean and has excellent crystal, which is unusual for cuprian material from Mozambique. I should say this, that it is the case for the purples anyway. This beautiful and rare round weighs 2.67 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.
