Mar 2009
Mint Green Garnet
24/03/09 22:52 Filed in: Latest Cut
Gems
One
new stone for the day... something I don’t cut too
often. This one is a Mint Green Grossularite
Garnet 2.69
ct. These stones come from Tanzania, and are
found in the same area as the Tanzanite.
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New Mahenge Spinel
16/03/09 19:52 Filed in: Latest Cut
Gems
I’ve been busy doing some garnets, but slipped in
this spinel over the weekend.
This one is from the Mahenge area in Morogoro
Tanzania. A very hot pink color, that gets a
bit more red in incandescent light, and more
pink in florescent.
1.04 cts.
New Grading System
For all stones posted after March 16, 2009 this grading system will be used. Stones previously posted will still have the 1-5 grade system.
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.
10 = Loop Clean
8 = Eye Clean
6 = Slightly Included
4 = Moderately Included
2 = Heavily Included
Values between are used when the stone is either a bit cleaner or less clean. It's very rare to find any stone score a 10 for clarity. 7 and higher makes for a very nice stone.
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
1-5: Low end commercial
6-7: Better quality commercial
8-8.5: Fine quality
8.5-9.5: Very fine quality
9.5-10: What the trade calls "gem"
1.04 cts.
New Grading System
For all stones posted after March 16, 2009 this grading system will be used. Stones previously posted will still have the 1-5 grade system.
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.
10 = Loop Clean
8 = Eye Clean
6 = Slightly Included
4 = Moderately Included
2 = Heavily Included
Values between are used when the stone is either a bit cleaner or less clean. It's very rare to find any stone score a 10 for clarity. 7 and higher makes for a very nice stone.
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
1-5: Low end commercial
6-7: Better quality commercial
8-8.5: Fine quality
8.5-9.5: Very fine quality
9.5-10: What the trade calls "gem"