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What does "negligible" fluor on an AGS cert actually mean?

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Phoenix

Ideal_Rock
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Does it mean no fluor at all, or could it mean slight or medium fluor?

One of the stones I just got is slightly hazy in certain lightlings. In fact, I noticed the haziness straightaway when I first got the piece of jewellery. I thought it was dirty so I cleaned and I cleaned and I cleaned it. The stone is still noticeably slightly hazy but only in certain environments; and in most lightings, it seems clear.

So yesterday I took it to my nail salon (as my own fluor light is out of battery and my nail salon has an LED light used to "cure" gel nails - I had noticed my BGD "blue" glowed under this light). So sure enough, the sometimes-hazy-stone glowed blue, and it seemed to be medium blue fluor. What suprised me was that the one next to it seemed to also glow blue, but more faint; so I'd say it has slight blue fluor.

I've checked the AGS certs and both say "negligible" fluor. I'm rather shocked that the stones I thought had no fluor actually do and I trusted the AGS certs. Moreover, what bothers me more is one of the stones is noticeably hazy!

Could AGS just be wrong in these two instances?
 
Re: What does "negligible" fluor on an AGS cert actually mea

AGS gives "negligible", "medium", "strong", and "very strong" grades on fluorescence. Logically, the "negligible" grade can include stones with no fluorescence to stones with fluorescence just short of "medium".

What is the clarity grade and what are the inclusions in the hazy stone? Even if the stone is a marginal "medium" graded as "negligible" I doubt the fluorescence by itself is the culprit for the hazy appearance.
 
Re: What does "negligible" fluor on an AGS cert actually mea

thbmok|1325566727|3093874 said:
AGS gives "negligible", "medium", "strong", and "very strong" grades on fluorescence. Logically, the "negligible" grade can include stones with no fluorescence to stones with fluorescence just short of "medium".

What is the clarity grade and what are the inclusions in the hazy stone? Even if the stone is a marginal "medium" graded as "negligible" I doubt the fluorescence by itself is the culprit for the hazy appearance.

Huh! I never thought that "neglibible" had slight to medium fluor! :o This is especially so since these stones are sold as part of the non-fluor line. I also wouldn't say that the hazy stone has fluor just short of MBF, it seems to me to be straight MBF.

The clarity grade is Si1 on the hazy stone (and VS2 on the one with slight BF). I did think that perhaps the cloud was the culprit; but looking at the plotted diagram there's not that much in terms of cloud, so it can't be the cloud that's causing the haziness, or at least not the main culprit, imo. Again, since these stones are not sold as stones with fluor, I expected no haziness at all (and no fluor, certainly not noticeable blue fluor).
 
Re: What does "negligible" fluor on an AGS cert actually mea

Under what kind lighting conditions does it appear hazy?

Do you have any other blues to compare it to? Does it appear usually hazy next to the other stones with blue fluor? :errrr:
 
Re: What does "negligible" fluor on an AGS cert actually mea

Yes, I think the best gauge is to compare the hazy stone side by side with other stones both with and without noticeable fluorescence. If you are unhappy with the stone definitely return it. I bought a stone with strong blue fluorescence and VS2 clear/white crystals under the table and I can't get it to go hazy in any light.

I'm not suggesting that the hazy appearance is mainly caused by the inclusions either, it's likely in combination with the fluorescence. In my experience fluorescence makes inclusions more visible when it is active, and that can affect the light return depending on where the inclusions are.

But do keep in mind that some stones can look hazy in certain lights even without fluorescence due to inclusions, and that's why we all stress how important it is to look at stones in a wide variety of lighting conditions and work with a vendor with good return policies.
 
Re: What does "negligible" fluor on an AGS cert actually mea

Is it just picking up some of the colour of the light, plus maybe a tiny bit of fluor? I have a diamond that is GIA fluorescence "none", and putting it under a UV lamp (short and long wave, particularly long) it does seem to glow a little, but I reckon it's just picking up a bit of the visible light. No idea on the hazy.
 
Re: What does "negligible" fluor on an AGS cert actually mea

Do the inclusions include clouds? I think the haziness is probably due to the inclusions and not to the BF. Is this stone from the BG signature line? Brian wouldn't let stones with MBF be in signature.
 
Re: What does "negligible" fluor on an AGS cert actually mea

I doubt that any cloudiness you see could be caused by a 'negligible' amount of fluorescence. You say that your stone has a plotted cloud. Where is the cloud located? Also, are there any clouds that aren't plotted such as those that may be listed under the comments section? I'm just thinking out loud here but it's possible that either the plotted cloud is reflecting a bit, or there may be a very dispersive cloud that isn't plotted lending a slightly hazy look to the stone. It's really hard to say without seeing the stone in person.

However, regardless of any of our views on the matter I would contact the vendor and ask them about it as they have, I assume, seen the stone and will be a better judge of what is actually going on. And please do report back with what they say as now I am really curious! HTH :read:
 
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