SGL Equipment


No gemological laboratory is properly equipped unless you have the right tools.  One of your most important tools are your own eyes and ability to discern what images you are seeing.  To help you along, a good microscope is a must, along with testing equipment such as the refractometer, polariscope, spectroscope and dichroscope.  An interest and background education in gemology along with a reference library will go a long way in getting you most of the answers.
There are times when one sees the need to go beyond basic testing equipment and utilize the services of a Gemological Laboratory.  While advanced equipment is important for diagnostic determinations, sometimes it takes the use of several machines to find all the missing pieces to the puzzle.
We hope you will consider the experienced services at Stone Group Labs. All the equipment listed below performs non-destructive tests.




XRF Geiger SAS spectrometer em


Raman 785 and 532 em


Vis NIR and UV spectrometers em



reference library 2


Microscopy station 3 no bottle


Analog testing station



FTIR – An essential for gem labs, this spectrometer transmits infrared energy through a gem to see molecular bonding. Besides gemstone typing and identification, it also looks for treatments such as polymers in jade, emerald and turquoise, or evidence of heat treatment in sapphires…  read more…






ED-XRF and Radiation Counter- Pictured at the left is an x-ray fluorescence spectrometer, on the right an SAS2000 spectrometer and Geiger counter station. The XRF equipment aims x-rays into the gems and its SDD detector is calibrated to see the atomic elements within. Used as an aid in determining country of origin, XRF can also see if a stone is a copper bearing tourmaline or lead glass ruby…    read more…






RAMAN – Pictured left is the Raman unit that uses a red laser to excite molecules and renders Raman signals unique to each mineral type. This unit is also equipped with microscopy to give results on internal mineral inclusions. At the right is a Gemmo Raman-SG which not only gives Raman readings but also photoluminescence results in stones such as synthetic diamonds. read more…






UV-VIS – The two units pictured are spectrometers that use ultraviolet, visible and near infrared light to produce a spectral readout of the absorption and emissions in gemstone materials.

In the center are the various light sources that cover those wide ranges. Many clues are unlocked in the results, even rendering clues such as country of origin. read more…






Reference library –  The most interesting stones often require more time in research than testing. We use our reference library and on-line resources, for research.  In addition SGL has gemstone lab samples consisting of thousands of gem materials used as control stones, as well as the stored results for comparison of equipment data.








Imaging and Measurements – Documenting what a stone looks like and its vital statistics allows lab reports to be matched to the correct stone.








Analog testing is well established and documented. It is most important when correlating results with other gemologists.  Instruments such as refractometers, polariscopes, dichroscopes and microscopes are a must for all gem labs.





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