silverbuggy
Shiny_Rock
- Joined
- Feb 18, 2009
- Messages
- 188
I recently found the following HCA cut rating calculator:
https://www.pricescope.com/cutadviser.asp
It grades a diamond based on the following 4 factors:
Light Return
Fire
Scintillation
Spread
A score of 0-2 is in the Excellent range with 0 being almost impossible to achieve. A LOWER score is better.
I was testing it out on GOG hearts&arrows diamonds but was disappointed by the results.
http://goodoldgold.com/diamond/4755/
1.76ct E VS1 $31,477
Score = 1.5
http://goodoldgold.com/diamond/4871/
1.52ct D VS2 $28,884
Score = 1.5 with pavilion angle 41.0, but drops to 2.3 if 41.1. Actual is 41.05 degrees.
http://goodoldgold.com/diamond/4843/
1.91ct E VS2 $27,755
Score = 2.5
http://goodoldgold.com/diamond/5065/
1.79ct D VS2 $27,345
Score = 1.8 with pavilion angle 41.0, but drops to 2.5 if 41.1. Actual is 41.05 degrees.
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2 questions for you experts and gemologists out there...
1) Shouldn''t a genuine hearts&arrows diamond have better ratings than this? I also tested a bunch of BlueNile signature-ideal diamonds with results much better than GOG''s diamonds...
2) Why does a 0.1 degree difference in pavillion angle cause such a big sway in the score?
https://www.pricescope.com/cutadviser.asp
It grades a diamond based on the following 4 factors:
Light Return
Fire
Scintillation
Spread
A score of 0-2 is in the Excellent range with 0 being almost impossible to achieve. A LOWER score is better.
I was testing it out on GOG hearts&arrows diamonds but was disappointed by the results.
http://goodoldgold.com/diamond/4755/
1.76ct E VS1 $31,477
Score = 1.5
http://goodoldgold.com/diamond/4871/
1.52ct D VS2 $28,884
Score = 1.5 with pavilion angle 41.0, but drops to 2.3 if 41.1. Actual is 41.05 degrees.
http://goodoldgold.com/diamond/4843/
1.91ct E VS2 $27,755
Score = 2.5
http://goodoldgold.com/diamond/5065/
1.79ct D VS2 $27,345
Score = 1.8 with pavilion angle 41.0, but drops to 2.5 if 41.1. Actual is 41.05 degrees.
-----------------------------------------------------------------------------------
2 questions for you experts and gemologists out there...
1) Shouldn''t a genuine hearts&arrows diamond have better ratings than this? I also tested a bunch of BlueNile signature-ideal diamonds with results much better than GOG''s diamonds...
2) Why does a 0.1 degree difference in pavillion angle cause such a big sway in the score?