Cuprian, nice pastel yellow standard round brilliant.

Nice medium light pastel yellow oval. This medium light pastel yellow oval appears to be eye clean. It has fine crystal and is very bright. It is not dichroic at all and weighs 4.20 carats.

This bright medium toned yellow does not have copper in its composition.

Cuprian, fine medium light pastel yellow round. This medium light pastel standard round brilliant seems unaffected by its copper content. It is bright, flashy and eye clean. I posted it with a similar yellow without copper. It weighs 2.25 carats.

This bright medium toned yellow has copper in its composition (detected with spectrometer)

 

This medium light pastel has exactly the same color as #322 and yet my spectrometer picks up the copper absorption curve in this posted round and does not in the oval.  The bright flashy round appears to be eye clean and of fine crystal.  It is also not dichroic and a bit toned down for a yellow.  It is too big for the droplets of color, but its heart lies there.  It weighs 2.25 carats.

To show you the similarities between the two yellows, this one with copper and the other oval I mentioned above, without copper, I am going to post both of them.  There might be some difference because of the different cuts, but they are dead ringers in color.

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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