You're welcome! Yeah, its actually more common than most folks realize :)

Although there are some diamonds that is not flourescence (rarely) but almost natural diamonds are fluorsescence under UV longwave.

Thank you!

It means that it has a strong fluorescence, where as mine had a medium blue. they can also show green, yellow and white.

You are most welcome, and thank you :)

Many synthetic or lab created emeralds will fluoresce red, the rough emerald cluster in this video is a lab created rough emerald. Rarely, a highly saturated natural emerald will fluoresce purple. This does not prove it is natural though, but in general, it is a good sign. If you really want to find out, I suggest sending it to a Laboratory, like GIA for analysis.

@@earthartgems my emerald kzfaq.info/get/bejne/lZt8q9Rz3p24j2Q.html what do you think??

What is an ultraviolet diamond tester?

@@earthartgems yes it says so which I bough it from.amazon India as ultraviolet diamond tester key chain

@@Khriebei29 So is it just an ultraviolet light like the one I use in the video? If so, it just shows if a diamond as fluorescence. There are not that many minerals that do fluoresce.

Only 25-30% of diamonds are blue under blacklight, and it lowers the value of the diamond (which I find ridiculous, I love the ones that glow).

Thank you, You're totally spot on, A better UV light is on my wish list... but Santa didn't get me one this year... sigh...

This is still LWUV yes?

@@davidsaintjohn4248 by the strict definition of anything under 400nm, yes. but that cutoff is obviously artificial and arbitrary. 395nm photons from a light like the one in this video simply don't have enough energy to excite fluorescence the VAST majority of materials which exhibit this property. you need 365nm or lower and it needs to be filtered to eliminate visible radiation from the diode or mercury tube.

@@Muonium1 agreed. I have a dual source from UV tools but if you know of better please share! 🙏💎🌈

@@davidsaintjohn4248 depends on what you need it for, but for fluor minerals I recommend filtered LED based lights for both near and far UV. For near UVA at 365nm any of the now generically available "C8" style lights for sale on any of the big online outlets will do. I recommend the $35 "WKDUN C8 365nm 5W UV Flashlight Torch" on amazon as the best light output for the price, and you can read my review on the item page there. For far UVC at 256nm your choices for intense LED sources are much more limited and there are probably at most 4 people selling these at the moment with Engenious Designs being the most reputable. Be prepared to shell out ridiculous $$$ for a UVC LED source, the AlN diodes are still cutting edge, very inefficient, have low manufacturing yield, and are expensive as hell. An 11w mercury tube like you have will work somewhat of course, but has very dim and diffuse output after the wood's filter. I also have an 11w Hg tube source, but it's a totally unfiltered germicidal bulb because I'm mainly interested in things like phosphorescence, cryoluminescence, and tenebrescence, which are observed after the excitation source is turned off anyway, and I want all the deep UVC I can get out of it, including the superdeep vacuum UV line light at 185nm. The Terlingua calcite phosphorescence under this radiation for example is spectacular.

Fluorescence is not an indicator of a stone being a diamond as there are many stones that do display fluorescence. It is merely an interesting characteristic.

Hmm, what minerals emit their own glow without UV Light?

It's not a "test" its just something fun you can do with a cheap UV light. A lot of mineral collectors love to check to their stones under UV lights and these diamonds and emeralds are not commonly thought of as florescent. That said, It is a "test" of sorts one can perform amid many other in a full gambit of tests to try to ID a stone, but it is in no way a definitive way to ID a gem.

@@earthartgems yeah, I found all that out… after watching this video, I did some research… I always thought that UVR was the best and most effective way to test gemstones to find out if they are nature grown or lab grown… My assumption was the natural earth grown diamonds, rubies, emeralds, etc are fluorescent and the lab grown ones aren’t… so, in a way, your video taught me a whole lot, it made me do a lot of research and learn everything I could about gemstones… lol XD so thanks! 👍🏼

@@xNecromancerxxx It's all about asking the right questions, which is pretty much summed up in your username :) Glad to help! And you're right, there is no consistent connection between lab diamonds vs naturals for their fluorescence. In fact, fluorescence is something that is always referred to on GIA reports because it varies so widely among natural diamonds, it is like a marker or characteristic in an individual stone. But there are probably a lot of other videos out there that get much deeper into that subject.