How does a non-fluorescent diamond look under UV light

[megeve]

I am just wondering a fluorescent diamond will look blue/purplish under UV light. But how does a non-fluorescent diamond look under UV? just plain colourless?

 

[kenny]

Diamonds with stronger fluorescence will look brighter under UV than those with less fluorescence.

Also fluorescence is not always blue.

 

[megeve]

Cool Kenny! Thanks for the illustration pic!

I just bought a loupe with an UV light function and was trying it out. All my diamonds glow with a blue/purplish color and I got a schock because these diamonds are stated under fluorescense None/negligible in GIA & AGS reports.

However, I found old diamond studs (before PS and no report) and one glows like the rest of diamonds and one has definitely flluorescense as shown in pic..

 

[stone-cold11]

looks like just facet glare to me.

 

[Lorelei]

Definitely looks like the centre diamond has fluorescence Meg.