A large round green jester of a tourmaline#936

large deep pale pastel round with consistent color This deep stone weighs 14.39 carats and is not dichroic. It has eight mains on both culet and crown. A nice bright clean gemstone with great crystal.

 

When I received this piece of rough from Africa it was rather hard to believe.  For at least 7 years I only cut tourmaline anymore and this was presented as tourmaline or I would not have purchased it.  The rough was completely water worn and had a pale pastel green hue(color) that remains constant no matter how you look at it.   I have received beryl before in the name of tourmaline, but rather than test it I moved on to the cutting process.  The shape of the preform evolved into a more teardrop shape, but frankly the teardrop does not have the great optics that a round has and this pale pastel needed all the flash it can get.    Therefor a deep round with eight horizontally split mains was born.  The top is also a modified eight main step cut.  In other words as a deep a round as I cut.  The gemstone polished beautifully, which would not been the case with beryl.  I know that beryl has a reputation of being a great polisher, but I find the using alumina on a stationary lap is not appropriate for beryl.  It maybe harder than tourmaline, but it is not strong enough to keep from marking frequently with my polishing process.

Now back to the being sure.  The 14.37 carat pale pastel green round has an index of refraction right in the range of tourmaline and a specific gravity the says tourmaline also.  So I am at peace and the gemstone is in the collection.  A fine addition.  When I got my spectrometer and tested all my collection I found some that did not belong, an iolite and some garnets,(this gemstone belonged again) and you will not be hearing their story.   Just how I found them will be in another post.

 

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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