PRESIDIUM Duo Tester Mode D'emploi page 14

Cleaning your gemstone prior to testing
Prepare a clean tissue. Carefully retrieve the gemstone
with tweezers and place the gemstone face down on the
table (Fig. 1.7).
Fig. 1.7
Gently rub the table of gemstone against the tissue/
jewellery cloth and place the gemstone on the centre of the
Test Pad (Fig. 1.8)
Fig. 1.8
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