Distinct fluorescence

[Stoneseekernc]

Was looking at a diamond today and the certification said "distinct fluorescence". I forgot which certification company graded it, but for the life of me I cannot find where that would fall between slight and very string fluorescence. Anyone have any ideas?

 

[diamondseeker2006]

Apparently GIA is none, faint, medium, strong, very strong:

http://4csblog.gia.edu/2012/understanding-diamond-fluorescence

We would only recommend looking at GIA graded stones (with the exception of some ideal cut stones by AGS). Other labs are less reliable.

 

[patricias]

I second the recommendation to stick to GIA. They are the most consistent and conservative lab out there. I have a GIA certified J color diamond with very strong blue fluorescence, and the fluor doesn't negatively affect the stone's appearance at all. It glows bright blue under a blacklight, which I think is really cool.

 

[Gypsy]

Stick to GIA or AGS only. Or if you are in Europe you can use HRD. And that stone is graded by neither of those, so it is irrelevant.

 

[John P]

"distinct fluorescence"

"Distinct" is the strongest fluorescence descriptor used on some EGL reports. Equivalent (+/-) to GIA Very Strong.

 

[Gypsy]

On EGL: [URL='https://www.pricescope.com/community/threads/egl-certification-are-any-of-them-ok.142863/']https://www.pricescope.com/community/threads/egl-certification-are-any-of-them-ok.142863/[/URL]

 

[Stoneseekernc]

Thanks for the valuable information. I found it even more telling that I couldn't even find the fluorescence gratings in EGLs website. And after reading other information--if the other values are not true GIA comparable values.

 

[John P]

Thanks for the valuable information. I found it even more telling that I couldn't even find the fluorescence gratings in EGLs website. And after reading other information--if the other values are not true GIA comparable values.

I think EGL uses different nomenclature, depending on which lab-location and report is requested. I saw a 2013 report with "Distinct Blue" in Antwerp last year. Here's an example from 2008.