ID of Blue Gems with Portable Instruments

Deljanin / Lightfoot

€28.00 Tax excluded €28.00 (tax excl.)

Tax excluded

Authors: Branko Deljanin and Randy Lightfoot

Published by Gemmological Research Industries Inc, 2026

This guide presents properties of the most common natural, treated and synthetic blue gems using 6 portable tools and instruments:

Microscope- to inspect the internal world of gems
PL Inspector/Jewellery Inspector – a mini-UV lamp to observe LW and SW fluorescence & phosphorescence of loose & monted gems
Portable polariscope /CPF (Cross polarised filters)/StrainView to observe birefringence patterns in crossed (at 90 degrees) orientation
DOVE – based on deep UV light (approx. 220nm) allowing for simpler analysis of diamonds and gems with comparisons with LW UV.
InSpectrum – compact spectrometer (Gemetrix) able to record both VIS (visible) absorption and PL (Photoluminescence) spectra.
EXA PL spectrometer (MAGILABS) to record emission spectra on 4 blue diamonds of different origins which are included in this booklet.

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