Speaking of fluorescence

[Gussie]

I have been super curious as to your opinions on fluorescence in this case.

I had a gia xxx 2.5ct, I VVS2 mbf (hca 1.9 FIC) stone. It was a 36/40.6 with a 56 table, full of fire, less white return. When I was in bright lights or in the sun, the stone looked a pale, icy blue color. I really hated it. Lucky me, I prefer warmer stones and even slightly yellow as opposed to any hint of icy white or blue. In your opinion, was this due to the cut and less than ideal scintillation or was it the fluorescence?

Thanks for your input!

 

[Wewechew]

I have a .9ct H VVS1 MBF 57 table, 36/40.6 and 60.6 depth and it glows blue in the sun. I always assumed it was the fluorescence.

 

[Gussie]

I have a .9ct H VVS1 MBF 57 table, 36/40.6 and 60.6 depth and it glows blue in the sun. I always assumed it was the fluorescence.

I was told it could be the scintillation but I always thought it was the mbf too. I am just trying to understand more. I am shocked at how picky I have become. I so wanted to like fluorescence because I really think it's a cool thing but I wasn't expecting to see mbf just from the sun.

 

[Gussie]

What part of Texas @Wewechew ?

 

[Wewechew]

I was told it could be the scintillation but I always thought it was the mbf too. I am just trying to understand more. I am shocked at how picky I have become. I so wanted to like fluorescence because I really think it's a cool thing but I wasn't expecting to see mbf just from the sun.

I have a pair of diamond studs that were my grandmothers. When I first got them I was comparing them in the sun and I noticed I heavily favored one over the other... turns out the one I favor has fluorescence while the other does not.

What part of Texas @Wewechew ?

DFW. I go to Houston for work here and there and when I choose to drive instead of fly my husband is always suspicious I'm driving so I can visit WF lol.

 

[Gussie]

I also have a rose cut that is an I with sbf. It doesn't turn blue in the sun. That makes me suspect that it is the cut that makes it turn blue, but comparing a rose cut to a mrb is like comparing apples to daffodils, lol.

 

[Wewechew]

I also have a rose cut that is an I with sbf. It doesn't turn blue in the sun. That makes me suspect that it is the cut that makes it turn blue, but comparing a rose cut to a mrb is like comparing apples to daffodils, lol.

Interesting... I've seen (in pictures) a couple rose cuts with medium or strong blue and they looked blue in the sunlight. I'll be curious to see what other PSers say.

 

[Gussie]

Just checked out my sbf rosie in the sun to be sure. Definitely doesn't turn the pale icy blue that the mrb did.

 

[sledge]

While blue is common, fluor can also be yellow. Also, it can effect color grading due to the UV lights used during the grading process.

https://www.pricescope.com/wiki/diamonds/diamond-flourescence

Good video of how a diamond with fluor can change based on lighting type.

 

[Wewechew]

Just checked out my sbf rosie in the sun to be sure. Definitely doesn't turn the pale icy blue that the mrb did.

I wonder if it’s a combo of BF and cut working together?

 

[ringo865]

I didn't think cut would really have anything to do with whether a diamond fluoresces. Either it is fluorescent or it isn't, right?

Different intensities of fluorescence, different angles or intensifies of the sun... those I could imagine having an effect on fluorescence. But not cut.

Have you tried putting your rose cut under a gel nail light?

 

[Gussie]

Yes, the rose cut shows definite fluorescence under a black light.

 

[HappyNewLife]

I have a 2.937 I/VS ACA with "negligible" fluor on the AGS cert, but that's total bologne. It's got to be closer to medium because with a UV light it looks like a Tiffany blue box. I went swimming with my ring this weekend (something that I never do!) and it was definitely looking light blue in the bright sun! I loved it though

 

[Wewechew]

I didn't think cut would really have anything to do with whether a diamond fluoresces. Either it is fluorescent or it isn't, right?

Different intensities of fluorescence, different angles or intensifies of the sun... those I could imagine having an effect on fluorescence. But not cut.

Have you tried putting your rose cut under a gel nail light?

I was speaking more in regards to multifaced vs rose cut with the fluorescence being seen more vividly.

 

[OoohShiny]

I was speaking more in regards to multifaced vs rose cut with the fluorescence being seen more vividly.

If fluorescence is caused by excitation of the internal structure by uv light wavelengths (I think??) perhaps it is the case that MRBs bounce the light rays around inside the stone more than Rose Cuts do, so MRBs will have more fluorescence due to longer internal lightpaths having more opportunity to excite, but Rose Cuts will have less fluor due to less complicated (i.e. shorter) internal lightpaths?

We need an expert in here! lol

 

[Wewechew]

If fluorescence is caused by excitation of the internal structure by uv light wavelengths (I think??) perhaps it is the case that MRBs bounce the light rays around inside the stone more than Rose Cuts do, so MRBs will have more fluorescence due to longer internal lightpaths having more opportunity to excite, but Rose Cuts will have less fluor due to less complicated (i.e. shorter) internal lightpaths?

We need an expert in here! lol

YES! That’s what I was trying to put into words

 

[Gussie]

I tend to think this too. The internal reflections of the mrb are magnifying the effect.

 

[Dancing Fire]

I have a 2.937 I/VS ACA with "negligible" fluor on the AGS cert, but that's total bologne.

Same with this stone "negligible" could it be the reflection from the blue sky?


Here's a VSB under the sun.

 

[bmfang]

I remember that @Texas Leaguer recently posted one of WF’s educational articles about fluorescence on here. Depending on which lab does the grading, they may grade fluorescence table up or down which may impact what grade is ultimately given. Then you also have the issue of directional fluorescence as well depending from what angle the fluorescent light source is coming from.

I’m a fan of it. A number of old family jewellery pieces we have exhibit blue fluorescence in the melee. I’m looking forward to the day that a piece exhibiting one of the other fluorescence colours shows up in a future stone for my wife.

 

[atp223]

I have a 2.937 I/VS ACA with "negligible" fluor on the AGS cert, but that's total bologne. It's got to be closer to medium because with a UV light it looks like a Tiffany blue box. I went swimming with my ring this weekend (something that I never do!) and it was definitely looking light blue in the bright sun! I loved it though

HNL...since our stones are basically sisters...mine does the same thing!

My original e-ring (that I lost ) was a BGD blue with MBF, and also looked blue in direct sunlight. This one is from the signature line and has allegedly “negligible” fluoro, but still turns blue in direct sunlight. I wish I had them both still so I could compare! But the shades of blue seem pretty similar! That one definitely glowed in the gel mani curing UV light, so next time I go I will check this one out.

Edit: so this leads me to believe the blue is not fluoro but perhaps the sky/direct sunlight? But I don’t know for sure!

 

[FL_Sol]

I own an ideal cut diamond, well cut CZs and a well cut moissanite and they all do that. I believe it is the reflection of the sky. Here are some quick photos of them all together:


I hope the pictures show it enough.

 

[Gussie]

The gia with mbf really turned the icy blue color. My ACA doesn't do that. Neither does my gia rose cut with sbf even in the strong Texas sun. I definitely think the facet pattern of a mrb multiplies (right word?) the fluorescence. It's very interesting to hear about others observations. Still learning here, lol!

 

[FL_Sol]

I forgot to mention, my diamond has MBF.

 

[Texas Leaguer]

I remember that @Texas Leaguer recently posted one of WF’s educational articles about fluorescence on here. Depending on which lab does the grading, they may grade fluorescence table up or down which may impact what grade is ultimately given. Then you also have the issue of directional fluorescence as well depending from what angle the fluorescent light source is coming from.

I’m a fan of it. A number of old family jewellery pieces we have exhibit blue fluorescence in the melee. I’m looking forward to the day that a piece exhibiting one of the other fluorescence colours shows up in a future stone for my wife.

@bmfang
here is the article I think you are referencing:
https://www.whiteflash.com/about-di...ion/diamond-fluorescence-good-or-bad-1322.htm

@JrJ and @ceg ,
Outdoors in direct sunlight is practically the only place that where UV is strong enough to activate the fluoro effect. The other places would be very close to a window on a sunny day (providing there is no UV blocking film on the window), and when viewing at close range under a fluorescent tube light.
Remember that the diamond is always scanning the hemisphere for light and will reflect any colors in the environment, such as a blue sky.
Direct sun is usually not the best lighting scenario to see a diamond's overall visual appeal as it can tend to look very contrasty and dark. Outdoors, filtered direct sunlight like that coming thru the leaves of trees can be very nice. A cloudy day will suppress fire and also blocks a significant portion of the UV needed to stimulate fluorescence, but will allow you to observe brightness very nicely.

 

[sledge]

While blue is common, fluor can also be yellow. Also, it can effect color grading due to the UV lights used during the grading process.

https://www.pricescope.com/wiki/diamonds/diamond-flourescence

@bmfang
here is the article I think you are referencing:
https://www.whiteflash.com/about-di...ion/diamond-fluorescence-good-or-bad-1322.htm

Thought all this sounded too familiar. Went back and looked and noticed the same author, @Texas Leaguer.

Thanks for making this a better place, much appreciated.

 

[HappyNewLife]

Same with this stone "negligible" could it be the reflection from the blue sky?


Here's a VSB under the sun.

I was told by PSer that the blueness in the sun is from the sky, but you can't deny that turquoise glow with a UV light!



(extremely hard to capture - it's SUPER obvious in a totally dark room, but then the camera is like NOPE)

 

[Wewechew]

I was told by PSer that the blueness in the sun is from the sky, but you can't deny that turquoise glow with a UV light!



(extremely hard to capture - it's SUPER obvious in a totally dark room, but then the camera is like NOPE)

I thought it was odd how hard it was to capture too. The camera has to be just right.

 

[Gussie]

Cool pics @Wewechew

 

[Gussie]

Talk about a unicorn for me- mrb with fluorescence that glows in black light yet never has the icy blue color in sunlight! Picky much?

 

[Dancing Fire]