Lightly included green with brown overtone shield cut. cuprian#188

Included, slightly browned green shield cut.  #188 The wispy inclusion in the larger shield cut are hard to see. The green is brown down a bit, but it is still a bright flashy gemstone for a medium dark tone level. It weighs 6.23 carats.

The wispy feathers in this larger medium plus toned shield cut are hard to see (best from the pavilion) and do not effect the flash.  The green is taken down a peg with a brown overtone in daylight, that is much less apparent in yellowish light.  But if we are going to count pegs, this is a cuprian tourmaline and that does bring it up a peg in my book.  I did not know this gemstone was copper bearing when I bought it and only discovered the fact with my spectrometer.  I have no idea whether its copper content is actual making a significant contribution to the gemstones color.  I does help make the shield cut unique in the collection.

The bottom line with this stone is a complex mixture of wispy feathers that are common in cuprian tourmaline,  a fine tone level of medium plus with a nice yellow green color slight modified with a brown overtone.  At 6.23 carats it is a fine sized for a shield cut.

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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