See photo gems and stones are fluorescent under UV LIGHT

Most of us know about fluorescence in gemstones, but how many use it as part of their gemmological testing routine? Here, Gem-A gemmology tutor Lily Faber, FGA DGA EG, delves deeper into fluorescence and explains why it can be both enlightening and enjoyable for gemmologists.

Luminescence in Gemmology

When we use the term luminescence in gemmology, it generally refers to the term photoluminescence, which is the emission of a cold, visible light when a gem material (or general substance) is excited by light of a shorter wavelength. Two examples are fluorescence and phosphorescence.

Fluorescence occurs when a gem material is illuminated by radiation of shorter wavelengths with higher energy.

OTHER USES

21 led uv torch for detection of poor hygiene detection

21 LED High Quality UV Torch for Curing Fly Tying Glue and Loca Glue

Use it 3-5 Minutes for Curing after applying the Glue

Functions with 3x AAA batteries - Not included

This Ultra Violet LED torch is great for detecting counterfeit items, identity cards, spotting fluorescent dyes or leaks during car or HVAC repairs, even during hunting or crime scene investigation.

It is very easy to use, it has a simple on/ off end cap push button switch.

With this UV torch you are able to detect the special marks made with fluorescent ink, that are normally invisible in ordinary light, and shows them up. It is ideal for use with certain banknotes (not UK banknotes), credit cards, travellers cheques, stamps and other items with security marks on them.

This unit uses twelve 395 nanometres (nm) wavelength UV LED's which is great for general purpose use, it is not suitable for UK bank notes, however for excellent results we strongly recommend our UV Bank Note Checker Torch,

The light is supplied on a handy wrist band which can be attached to belts or bags for ease of use.

Warning: Do not look direct into any UV source, keep away from children.

Uses Include

Coolant detection

Night club hand stamps

Fluorescent dye leaks

Forgery detection

ID and document Verification

Pet and pest stains

Reading invisible fluorescent inks

Insect illumination

Antique inspection

Art forgery/repair tests

Detecting some bacteria

Adhesive curing

Torch colour can differ depending on availability

It would be appreciated that if there is any problem with your order you kindly message me first before opening a case as i can usually resolve any issues quickly and efficiently - many thanks.

For most applications - uv light should be used in the dark for best results.