- Mar 4, 2010
Excuse the ignorant question, but are all lab-grown diamonds excellently cut and flawless? Do they vary in terms of colour?
No, stonecold, my account isn't hacked. I'm sorry it came off like that.Stone-cold11|1309227730|2956719 said:Huh? Totally different things you are talking about. Cut has nothing to do with how the stone comes about, nothing to do with clarity and clarity and cut has nothing to do with color.
To see the range of cut, clarity and color, just go to one of the vendor's site, you will see a range of cut, color and clarity available.
Is this account hacked or what?
Currently, none of the major labs that grade synthetic diamonds provided a "cut word" on the report, but do provide varying amounts of cut measurements. GIA lists depth and table. IGI also includes crown and pavilion percents. EGL includes those plus crown and pavilion angles. (Some reports vary though and don't always have all those listed.) Using those along with polish, symmetry, girdle thickness, etc., you can evaluate the cut (or plug it into the HCA), but it isn't as simple as reading 'Very Good' or 'Excellent' straight off the report.mayerling said:I see info on colour and clarity, but not on cut.
Plus, last time I checked, AGS doesn't grade synthetic diamonds. You are right on about the HCA and other cut tools measuring the white light performance. While still relevant, the cut isn't as important as color for fancy colored diamonds (mined or synthetic).Stone-cold11 said:Well, no one else grades fancy cut performance except AGS and even that lab has only a few shapes graded so for most of the stones, cut grade is useless. Only rounds have the angles from which we can roughly guess the performance on the HCA but that is for optimal light performance of colorless stone and not for best color, which is what color diamonds are cut for.
Did they provided a reason for why they do not grade synthetic?EEFranklin|1309468220|2959388 said:Plus, last time I checked, AGS doesn't grade synthetic diamonds. You are right on about the HCA and other cut tools measuring the white light performance. While still relevant, the cut isn't as important as color for fancy colored diamonds (mined or synthetic).
It is more that AGS hasn't actively made the decision to grade synthetic diamonds, rather than actively deciding not to grade synthetics. EGL and IGI made the decision many years ago (pre-2004) and GIA started grading them in 2007. AGS may come around once synthetic white diamonds are more readily available.Stone-cold11|1309533070|2959894 said:Did they provided a reason for why they do not grade synthetic?
If you're not a behemoth like GIA, you have to pick and choose what services you want to offer. Most synthetics are fancy colors for example, an area they don't grade for either natural or synthetics. It's not that they couldn't ramp up to do this but they just don't have the staff and the budget to take on another product category at this time.Stone-cold11|1309533070|2959894 said:Did they provided a reason for why they do not grade synthetic?