Greenish yellow and a tale of discovered copper, round #61

Cuprian yellow with wash of green included round.  #61 This standard round brilliant has many light wispy feathers. It has an average brightnes and a nice mostly yellow color with a wash of green. It contains copper and weighs 3.35 carats.

This yellow tourmaline with a green wash does not have particularly good crystal, because it has a wide assortment of faint wispy feathers.  It is flashy and about average in brightness, despite the fact, that yellow greens usually have higher brightness levels, than most colors of tourmaline.  So what makes this standard round brilliant with a nice, but not exceptional color, more interesting than usual.  It has copper in it as a chromophore.  A chromophore is a trace element that effects the color of the gemstone that it is dissolved in.  I found copper’s signature absorption peaks with my spectrometer.  I have no idea how much effect the copper is having on the color of this gemstone, but the copper is interacting with the light coming into the gem, in the visible light range.  The gemstone weighs 3.35 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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