Diamond UV Fluorescence Tester:
To properly use a UV keyring, take the following steps:
- Never look directly into the light
- Turn off surrounding lights so you are in a dark environment.
- Place the gemstone table-down if facetted. If table up, the gemstone may reflect the UV light into your eyes and creating confusing, conflicting or inconclusive results.
- Hold the keyring approximately two inches away from the stone and, if testing multiple gems, always be consistent with the distance at which you hold the light.
- Record whether the stone is inert or fluorescing, and the strength of the reaction.
Sometimes you may see some dull purple or red light in the gemstone or on a few facet edges. This means that the gemstone is reflecting the purple UV light and is not itself a fluorescent reaction.
This LED UV source has the exact wavelength UV light that detects fluorescence where others miss, even off color diamonds. A blue fluorescense, may be a positive factor since the diamond will look whiter. Yellow is usually a negative indication. The strength of the fluorescence is a secondary factor ranging from None, Faint, Medium, Strong, Very strong.