UV light passes through thick glass and causes fluorescence in diamonds indoors.

To dispel the argument that UV light that causes color whitening in blue fluorescent diamonds does not pass through windows. This bathroom door is 10mm thick or 0.4 inches!
The center diamond is GIA Medium Blue. Clearly the diamonds are fluorescing.
What is more, the long wave frequency used for grading fluorescence has around half the effect as these simple cheap torches which work in the near visible range. It is for this reason that earlier tests (with the wrong light meters) are totally irrelevant.
This simple test shows that very long wave UV that is in the just or near visible range does pass through windows.

[faridhasansazali]

do some diamonds glow yellow under longwave uv light and glow blue under shortwave uv light?

[houmanmo]

How do i tell the difference between lab dimonds and real dimonds in earth

[TMS]

Or you could just save a lot of time and look up the optical transmittance of glass. Around 85% transparent at 365nm. Science.

[ramialhalabi]

خلونا بموضوعنا السبع بهارات و فوائده الغريبة

[Adliscience]

Do Rough diamonds fluoresce with the UV light? or is it only the cut diamond?

[yaskermani]

I tried this with my friends, they saw my rings diamonds blue i saw them pink, i don’t know why

[Muonium]

this looks like 400nm light is that the case? have you ever seen any diamonds fluoresce a color other than blue and does 400nm excite phosphorescence in any diamonds or is it only shorter wavelengths?

[kookaburrakookaburra]

Shining it through a glass window is irrelevant.

[pawansoni]

What hey natural rock crystal colorless certificate

[mariakristinahawl]

Low or no fluorescence in diamonds = very high quality diamonds.