Important things to know
EXA™ detects natural diamond by analysing it's photoluminescence spectrum. The samples are illuminated with strong longwave ultraviolet light (LWUV) which is almost invisible yet harmful for eyes. Never look directly in to the probe end. It is advised to use the supplied polycarbonate safety goggles during prolonged use of the instrument.
We have embedded a very sensitive spectrometer inside EXA™ for providing accurate results. For this reason the instrument absolutely hates strong ambient lightning and especially fluorescent tubes. The ”spiky" light of fluorescent tubes pollutes the spectroscopical analysis to the point that many natural stones are referred for further tests (so called false negatives). Please switch off fluorescent tubes during the use of the instrument.
EXA™ is not a diamond type tester, so it very often correctly reports type IIa natural diamonds as natural instead of referring them for further tests. The term natural strictly means that the stone has been mined from the Earth instead of grown in a factory. Type IIa stone passing the test is a natural diamond but may have been subjected to HPHT-treatment for enhancing its color grade. EXA™can not detect such treatment.