Chrome Tourmalines are one of my favorites. The
intense green color due to chromium sets it apart
from the more common green tourmaline. True chrome
green tourmaline gems are only found in Tanzania. A
chrome tourmaline can easily be separated from a
green tourmaline by looking at it through a chelsea
filter. A true chrome will look red, where as a green
tourmaline will look green.
Tourmaline is the birthstone for October, and has a hardness of 7 to 7.5
Grading System Used
Color is the most important and complex to grade. Color is made up of three components, hue, saturation and tone. Color will be graded on a scale of 1 to 10 taking these three factors into consideration.
Clarity is graded on a scale of 1 to 10, with 10 being loop clean under a 10X loop.
Brilliance - will be a combination of Cut, Sparkle, light return, Proportion and Crystal. Graded on a scale of 1 to 5, with 5 being the best.
Total Quality Rating - Is the combined score of these 3 with a possible best score of 10
Tourmaline is the birthstone for October, and has a hardness of 7 to 7.5
Grading System Used
Color is the most important and complex to grade. Color is made up of three components, hue, saturation and tone. Color will be graded on a scale of 1 to 10 taking these three factors into consideration.
Clarity is graded on a scale of 1 to 10, with 10 being loop clean under a 10X loop.
Brilliance - will be a combination of Cut, Sparkle, light return, Proportion and Crystal. Graded on a scale of 1 to 5, with 5 being the best.
Total Quality Rating - Is the combined score of these 3 with a possible best score of 10
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Gem 911 - Chrome Green Tourmaline$318.001.59 ct. A new stone from my trip to Tanzania.
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Gem 540 - Chrome Green Tourmaline$131.000.75 ct. A very nice color stone cut in a classic shape
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Gem 258 - Chrome Green Tourmaline$350.001.02 ct. A very nice rich chrome green stone in an interesting rectangular design
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Gem 213 - Chrome Green Tourmaline$289.001.33 cts. This is a rare chrome tourmaline. Excellent deep pure green color in a trillion shape
