Olive green under the girdle and forest green around, oval

Bright flash, forest green, around a duller center, olive green, oval. This stone shows a reduced transparency down the c axis. Its table is cut perpendicular to the c axis and that makes it easy to see. Around the edges are bright while the center is dull, greens. It weighs 2.36 carats.

I have posted before about an interesting phenomenon of decreased transparency down the c axis.  This green gemstone is an excellent example of that phenomenon.  Under the table, which is perpendicular to the c axis, is a bit darker olive green that is very reluctant to flash.  While around the table is a ring of forest green flash that is more of what I would expect from this oval.  I have to admit that I had read about this phenomenon, but never seen it as clearly before, as I now see it in this gemstone.

The oval is clean and the circle around the table bright and flashy.  Once you see the duller center it is quite noticeable.  The gemstone weighs 2.36 carats and keeps me twisting the stone trying to get flash from the center.


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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