A dynamic tidal basin of color, yellow, orange, brown, purple, pink round

It is nice to finish a smaller standard round brilliant of 1.75 carats without having anything to pull my hair out for.  The stone is probably rich in manganese of different valence states and high manganese can lead to a fast polish if your not too bother by a little undercutting.  The most unusual thing about this gemstone is the color dynamics that are set up by orienting the table parallel to the principle axis.

With this configuration you can easily see slightly purplish pink sectors and  yellowish orange brown sectors.  The amount of each changes significantly with the quality of the white light used for illumination.  Sometimes the entire center of the stone is the orangish color (that can appear more or less brown) and only a few edge sectors of the pink, while under other white lights the stone appears mostly pink (that can appear with more or less purple).   This is what I call a dynamic color arrangement brought to you by a dichroic gemstone with unstable colors of approximately the tonal values (medium).

And when you live with this modest gemstone for awhile you know it has to be a tourmaline.


Picture to follow.


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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