Unlike natural diamonds, the HPHT-grown stones that represent the majority of today’s synthetic melee diamonds glow strongly when exposed to short-wave ultraviolet light.
The Geometrix Melee Diamond Inspector makes use of this fluorescent property with a UV/white light lamp combo: Potential synthetics are exposed to 255 nm UV when inserted into the unit, after which the user can easily detect the resulting glow with his or her smartphone’s camera. No other equipment is needed! The Geometrix inspector can be used on either rough or polished stones, parcels of melee, or single diamonds of larger sizes.
The unit is lightweight and runs on either AC power (adapter included) or 9V batteries for complete portability.
Both the Jewellery Inspector and the PL-Inspector allow observation of fluorescence and phosphorescence from SW (short wave) and LW (long-wave) ultra-violet illumination. These observations can help a gemmologist determine whether a diamond or gem is synthetic, treated or natural. The colour and intensity of the fluorescence provides a useful indicator. A common test is to determine whether the SW intensity is brighter than the LW, which is suggestive of a synthetic diamond.
The Jewellery Inspector differs from the PL-Inspector in providing a larger viewing area (of 50 mm x 50 mm) and the Jewellery Inspector can also be used with a custom jewellery holder (supplied).