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ť ===+++what is Average Girdle Diameter (AGD)? how it affect the beauty?

===+++what is Average Girdle Diameter (AGD)? how it affect the beauty?

P: 4/29/2009 12:18:33 AM
Legend Rough Rock Total Posts: 33 Last Post: 5/25/2009 Member Since: 4/24/2009	Hello, I have a friend saying that the "Average Girdle Diameter (AGD) is 8.13 (from measurement 8.11-8.15x5.00). This diamond has a little higher crown which gives it more fires (flashes of rainbow). Diamonds have two ways of "speaking": fire or brightness. I like fire :)" given depth 61.5, table 56% I couldn't contact him back yet, so wonder what range of AGD consider "fire" ? thanks.
Posted: 4/29/2009 12:18:33 AM

There are 4 replies to this message. There are 4 replies on this page.

P: 4/29/2009 5:27:45 AM
Lorelei Ideal Rock Total Posts: 34,212 Last Post: 11/22/2009 Member Since: 4/30/2005	Date: 4/29/2009 12:18:33 AM Author:Legend Hello, I have a friend saying that the 'Average Girdle Diameter (AGD) is 8.13 (from measurement 8.11-8.15x5.00). This diamond has a little higher crown which gives it more fires (flashes of rainbow). Diamonds have two ways of 'speaking': fire or brightness. I like fire :)' given depth 61.5, table 56% I couldn't contact him back yet, so wonder what range of AGD consider 'fire' ? thanks. I hope I am understanding correctly, yes fire is aided by a higher crown angle and also a smaller table can help. Some seek out fiery ideal cut diamonds ( FIC) which typically have a steeper crown angle, pavilion angle of no more than 40.6, and a smallish table. The trade off can be with these that sometimes they can face up a little small for the weight as these diamonds can have increased depth. The girdle does not have anything to do with fire. Averages are not used for girdle measurements just the minimum and maximum in MM. Nothing is more sacred as the bond between horse and rider...no other creature can ever become so emotionally close to a human as a horse. When a horse dies, the memory lives on because an enormous part of his owner's heart, soul, very existence dies also...but that can never be laid to rest, it is not meant to be... - Stephanie M Thorn
Posted: 4/29/2009 5:27:45 AM

P: 4/29/2009 5:30:16 AM
Stone-cold11 Ideal Rock Total Posts: 6,859 Last Post: 11/22/2009 Member Since: 9/9/2008	That is just the diameter of the stone, it has nothing to do with performance, just spread. The diameter tells you nothing about the cut, you need the angles. A heavier stone will probably have a bigger diameter, a smaller shallower cut stone can also have a bigger diameter.
Posted: 4/29/2009 5:30:16 AM

P: 4/29/2009 6:03:08 AM
Paul-Antwerp Ideal Rock Total Posts: 1,902 Last Post: 11/20/2009 Member Since: 9/3/2002	The only correct thing that I see in the words of your friend is that he calculates the average of the diameter correctly. From these measurements, he cannot derive that the stone has a higher or a more shallow crown. Also, when he says that a higher crown gives more fire, this is incorrect. All other factors being equal, a higher crown might increase the likelihood of the stone showing more fire. If however, the other angles are off and the stone leaks more light through the pavilion, the likelihood of fire decreases. And whether the stone will actually show fire depends highly on the lighting environment. In any case, a stone can be both bright and fiery, one does not rule out the other. Live long, Paul Slegers Infinity Diamonds www.CraftedByInfinity.com
Posted: 4/29/2009 6:03:08 AM

P: 4/29/2009 8:51:11 AM
Legend Rough Rock Total Posts: 33 Last Post: 5/25/2009 Member Since: 4/24/2009	Thank you all for the info.
Posted: 4/29/2009 8:51:11 AM

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