- Joined
- Dec 8, 2009
- Messages
- 35
Ditto, the naked untrained eye cannot normally tell the difference.Date: 12/10/2009 4:55:36 PM
Author: dreamer_dachsie
To the untrained eye anything good and above looks the same.
Not sure about AGS, but GIA will not award an excellent cut grade (round brilliant) unless both P and S are at least ''VG'', so its the grading organisation not just the marketplace, thats the driverDate: 12/11/2009 1:06:16 PM
Author: Rockdiamond
If we''re talking symmetry, a trained eye may be able to see why a stone was downgraded to good, naked eye.
If we''re talking polish, there''s very few cases where the ''defect'' or shortfall in polish could be visible with the naked eye.
Even a trained eye would need magnification- and even then, the reason GIA downgraded may be near impossible to find.
I agree with Oldminer that in today''s market ( in round diamonds primarily) cutters MUST achieve VG or EX to be considered in the ''Ideal Cut'' category. Regardless if it''s possible to see naked eye.
The problem is not in a vacuum with everything being equal with just the symmetry and/or polish changing. The larger issue is WHY was the diamond lowered to VG symmetry, which meet points didn''t line up or many other factors. While the symmetry by itself may not cause a problem there may be other issues with a VG stone or other reasons why ther cutter decided not to finish the stone to the highest polish standards.Date: 12/11/2009 1:50:34 PM
Author: hair guru
This has been an eye opener since I''ve been not even looking at diamonds with less than excellent polish and sym. based on the idea that I thought you could see a difference by casually looking.Can''t thank you folks enough for your time in explaining the real deal.![]()
Everything in life has its price, how much are you willing to pay?
These links should explain what you need to know, symmetry and polish. Also bear in mind that physical symmetry which the labs grade is not the same as optical symmetry which is the result of cutting precision resulting in a hearts and arrows pattern. Also one would not normally notice any difference between VG polish and symmetry or above in images such as Idealscope or ASET.Date: 12/11/2009 1:50:34 PM
Author: hair guru
This has been an eye opener since I've been not even looking at diamonds with less than excellent polish and sym. based on the idea that I thought you could see a difference by casually looking.Can't thank you folks enough for your time in explaining the real deal.![]()
Everything in life has its price, how much are you willing to pay?