PRESIDIUM PGI-TD5612 Mode D'emploi page 16

For mounted jewelry or gemstones:
Hold the jewelry or mounted gemstone with one hand and
the tester with the other hand (Fig. 2.3).
For proper operation of the tester, the thumb and index
finger must always be placed on the metal grip of the
tester.
Press the probe tip of the tester against the gemstone.
Ensure the tip is fully depressed for consistent pressure
between the tip and the gemstone.
Note: Care should be taken when testing mounted
jewelry. Users must ensure that the stones are securely
mounted before conducting the test as the gap between
the stone and setting might lead to an inaccurate reading.
For loose gemstones:
Hold the gemstone with one hand while holding the tester
with the other hand (Fig. 2.4).
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Fig. 2.3
Fig. 2.4