Brown, long ratio oval, table perpendicular to principle axis. cuprain #268

A brown, long ratio, oval that is cuprian.  #268 I like this oval because it has the purest brown in the collection. It appears to be eye clean and moderately dichroic. It is bright and flashy for a medium toned oval. It weighs 3.87 carats.

I like this oval’s color.  It is the closest to a pure brown in the collection.  I does approach brown from the yellow side, but it has no pretenses of having a fancy name.  It has a nice even color, despite being dichroic, because its table is cut perpendicular to the principle axis (c).  The long ratio oval appears to be eye clean and with fine crystal.  It weighs 3.87 carats.

This is kind of a foot note.  When I looked at the storage box, on which I write down the most important important information about the gemstone, I see it is cuprian.  I sure I did not buy it as cuprian and that I found out using my spectrometer.  Still I have never seen any mention of brown cuprian and I have tried to stay up on color in cuprian tourmaline.  I would have said that this piece came from East Africa if I had to put down an origin, but it must have come from Mozambique and sometime before copper was discover there.  Interesting.

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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