Slightly included, nicely saturated, yellow green, cuprian, droplet of color.#174

Bright, well saturated, yellow green, cuprian droplet of color  #174 This standard round brilliant is lightly included and has a well saturated color. It is cuprian and came from Mozambique. It weighs 1.46 carats. The droplets of color must have cuprian members.

I was most fortunate to be in the hunt for different colors in tourmaline, when Mozambique began to produce cuprian tourmaline.  Then it was years before the copper bearing nature of the deposit was revealed in a reverse Alexandrite color change tourmaline, I sent to the GIA to be analyzed.   To follow up on the cuprian tourmaline adventure, that has pretty much ended, I purchased a spectrometer.   With this instrument I analyzed all my gemstones for copper and found quite a few that I did not buy as cuprian and did not realize contained copper, based on their color.  I also verified the cuprian nature of  the stones I purchased as copper bearing and satisfied myself that some colors, usually shades of purple, are definitively copper bearing.

The posted standard round brilliant has a more saturated color than many yellow greens.  It is also quite bright, but I had no idea is contained copper until I tested it with my spectrometer. It is included, but only slightly, like most cuprian tourmaline from Mozambique are.  I am not sure that copper has much effect on the color of this gemstone, but the droplet of color is bright and very attractive so let it be.  It weighs 1.46 carats.


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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