Magnificent bicolor with yellow crown and rust culet, orange round. Del Delgato#791

Large deep round with twelve mains, orange (yellow/rust), Del Gado This stone is exceptional and one of the finest in the collection. It has a yellow crown and a rust pavilion. It has a full set of twelve mains and has no problems. It weighs 12.95 carats.

I have put together a general post about Del Gado and other sources of rough that peaked at different times in my time of collection building.  Still it should be said here that Del Gado, which is the most northern of all the states in Mozambique is not known as a source of tourmaline and the period of availability of rough was very brief.  The GIA has determined that the material from there might be either Liddicoatite (my guess in this case) or Dravite.  They are both much less common members of the tourmaline group of related minerals than Elbaite, which is the dominant species of gem quality tourmaline.  The rough was water worn,  very blocky and often bicolor.  I certainly was not sure what level of orange I would get with the bicolor piece of rough that became this gemstone, but layering the colors as I did was the only way to get as deep as stone as I could and get a decent yield.

What do you get when you have a yellow crown and rust in the culet, the most incredible orange that I have ever seen in tourmaline.  Of course if you tilt the gemstone far enough off face up, you can see its secrets, but face up in my secret place, next to a small twisted florescent light in a yellowish shade, the headlight of orange is overwhelming.  There is absolutely nothing in this large deep round that inhibits the beauty of the orange glory,  Nothing included or brownish, that is for sure.  The gemstone has twelve horizontally cut mains in the pavilion and a high crown with twelve mains.  It weighs 12.95 carats of one of the most sought after colors, for me, in the glorious rainbow of tourmaline colors (also includes gray and brown).

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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