| Author | Topic: Emerald Cut - rate |
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emerald999 rough rock Posts: 4 |
posted 06-06-2001 01:06 PM
How do the numbers look on this emerald cut and how much would it sell for? 1.23 carat Just looking at it, it appears to have more scintillation/dispersion than any others that I have seen in the overpriced mall type stores. |
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leonid Moderator Posts: 518 |
posted 06-06-2001 01:32 PM
Hi Emerald999, Proportions of the diamond look very good indeed - AGA class 2A ( see www.gemappraisers.com ). Only crown height is a bit low but crown angle is within 2A range. Probably this is the reason why it looks much better than other emeralds you've seen. Besides it have good spread hence should look larger for its weight. I didn't find exact diamond in the web so I can only guess the price starting from $8k-9k. Does it have a grading report (GIA, EGL)? Where did you get crown and pavilion measurements? |
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emerald999 rough rock Posts: 4 |
posted 06-06-2001 02:40 PM
It is GIA certified. I got the crown height percentage and pavillion depth percentage from the dealer who had a Sarin machine. I calculated the angles based on those numbers. That should put me pretty close to the actual angles, correct? |
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leonid Moderator Posts: 518 |
posted 06-06-2001 02:52 PM
Frankly, I'm not sure. It depends on how table size was calculated. Obviously it can be different for different directions. Same for the angles. Nonetheless, even 10.5% crown height is not bad. It is more important that you can see the difference between this stone and others. |
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emerald999 rough rock Posts: 4 |
posted 06-06-2001 03:14 PM
Is there an ideal pavillion angle for an emerald cut? Is there an ideal pavillion depth as compared to the total depth (i.e. should the pavillion be 2/3 of the total depth)? Finally, is there an ideal length and width of a 1 ct, 1.25 ct, and 1.5 ct emerald cut? (I had heard that most 1 ct's are around 7mm x 5mm). Thanks for the info!!! |
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leonid Moderator Posts: 518 |
posted 06-06-2001 03:44 PM
Look at this chart for emeralds: www.gemappraisers.com/chrt3.htm There is no ideal cut for fancies. 2A is the best grade. You can derive pavilion depth based on total depth, crown height and girdle thickness. |
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emerald999 rough rock Posts: 4 |
posted 06-06-2001 03:54 PM
Thanks, what about pavillion angle? Based on the chart I can get an ideal depth for the pavillion at 45.75%-ish, but not an angle. (62.5 total - 13.5 crown - 3.25 girdle = 45.75 pavillion). Of course that is assuming that your total depth is near 62.5% to begin with. I would imagine that would change as the other numbers increase/decreased. (i.e. if your diamond had a total depth of 70%, a 45.75% depth would probably be too shallow to look the best that is could with a 70% total depth). |
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leonid Moderator Posts: 518 |
posted 06-06-2001 06:24 PM
I guess it should be addressed to David Atlas, developer of the AGA system. |
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Cut Nut cut rock Posts: 151 |
posted 06-09-2001 03:59 PM
There is no one pavilion angle, just a whole bunch of them. Look in the tutorial here and find Dave Atlas's info on AGA standards. on the #'s it looks good to me, but i am not a fancy shape expert garry Holloway |
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