Great blue green with a few visible growth tubes oval.#1138

Great blue green color with a few growth tubes oval. This medium toned oval with a great blue green color has a few growth tubes deep in the culet. It is still nice and flashy and weighs 1.68 carats.

I really like this medium plus tone level of bright blue green color.  The gemstone has one fault. There are a few quite visible growth tubes deep in the culet that parallel the sides of the oval.  I remember thinking that tubes like that were rutile in a similar stone years ago, but I am sure they are growth tubes now. Growth tubes are formed when something interrupts the growth of the crystal in the principal axis direction.  The rest of the crystal continues to develop, but a tube with flat sides is formed over the area of the c axis that stopped growing.  They always parallel the c axis. The oval weighs 1.68 carats and its flash is unaffected by the growth tubes.

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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