If a medium girdle is preferred why do the Whiteflash A Cut Above diamonds mostly have thin girdles with a lot of them starting at 0.7%? As these are Superideal Cuts why are they so thin and why can they not be medium for this status of cut?
QUOTE "Girdle thickness should ideally be between thin, medium and slightly thick. There is almost always some variation in girdle thickness around a stone. There are often four small, thin areas reflecting the original shape of the octahedral rough diamond crystal. These thin areas should not be set in a claw setting in an exposed position because they are also cleavage directions. If a diamond is struck in these directions on extremely thin to thin girdles they can and will chip."
The above is quoted from the tutorial on this site. I have also read on the forums before that a 'medium girdle is preferred', the book by Fred Cuellar also recommends this (I know some do not agree with his recommendations). I have read Dave Atlas's grade parameters but did not take it from there as I have not really studied them yet. I have also read that GIA grades are different from AGS and 0.7% is thin by AGS standards but is very thin by GIA standards.
GIA have a sliding scale based almost on millimeters rather than %.
It makes some sense. A .50ct diamond with a 2% girdle is 0.1mm.
A 10ct 14mm diamond could happily get by with a 0.1mm girdle, where as GIA would call that 2.8mm girdle very thick 9I think - did not look it up though).
Yes you can visually see a difference between the 2 cuts. One is much like the description of 8*'s in performance. Big, bold flashes of light and color. The other cut is more subtle, yet very sparkly with flashes of color and light. I previewed 2 diamonds from White Flash. One was their Conventional (older) cut and the other was a New style ACA. Both are gorgeous. Just depends on your personal preference.
I don't know what the cut difference is. Something to do with eliminating light leakage.
Girdle thickness quoted on a WF ACA Cert is an average thickness, from the peaks to the valleys of the facets.
We prefer to call the 2 cuts the "classic" A CUT ABOVE and the "new line" A CUT ABOVE. The main difference is that there is even less light leakage in the new line. Some have said that there is more white light in the new line. A CUT ABOVE continues to cut both "models".
Although there is no name for the new version A Cut Above is it marked on website differently say if you were going to select and buy one of the stones on the website or do you need to contact Whiteflash by e-mail to ask which version you are looking at?
I am sure this is going to be a most magnificent ring, Dave! You can't go wrong with an ACA, much less 5 of them. And a custom band for the set! You must post eye candy when it's done. You can always cheat like I did and get the jeweler to take pics for you!
If you click on the details of any of the A CUT ABOVE diamonds, if you see a dark red idealscope image (see below), the diamond is a new line ACA. If there is no idealscope image it is a classic line ACA. However, as is always the case with an ever changing database, there are a few brand new ACA's (new line)on the way back from the AGS that have been entered into the database but that have not had the images loaded yet.
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