Dichroic greenish yellow eye candy, emerald cut

Great piece of greenish yellow eye candy, emerald cut This emerald cut has a very bright cheerful presences. The dichroic color in the yellower ends and greener sides work together to make a blazer. It appears eye clean with fine crystal. It weighs 2.67 carats.

One of the features I love about color in tourmaline is how different a color such as yellow green can look/feel in different gemstones.  I think there are at least three different sets of conditions that can produce a yellow to green stone in Elbaite, the most common species of tourmaline in gemstones.  They are; an iron chromophore in the richer greens on the yellow side,  manganese titanium with low iron chromophore, for yellower greens and a color center induced by radiation for pure yellows.  The chromophores deal with trace elements in the tourmalines and the color center deals with the rearrangement of elements in the tourmaline.

This brilliant emerald cut, that is a fine example of eye candy, looks like it came from a different world than the pure yellow to yellow with a touch of green that are rather toned down pastels.  And I bet they are.  The complexities of tourmaline color, along with difficulties in analyzing tourmaline still leaves many origins of color in tourmaline unanswered.

Back to the posted gemstone.  It is eye clean and has fine crystal, which makes a fine setting for yellower ends and slightly green sides in this emerald cut.  The different dichroic colors don’t fight each other, but blend into a blazer.  The gemstone 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.
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