PRESIDIUM Duo Tester Mode D'emploi page 6

III. About your Presidium Duo Tester (PDT)
The Presidium Duo Tester's thermal measurement is based
on an invention by Professor Julian Goldsmid, from the
University of New South Wales, Australia. It was developed
to help distinguish between diamonds and its simulants us-
ing the principles of thermal conductivity. Diamonds, with
their exceptional heat conductivity properties are unlike any
other simulants and are therefore not easily replicable. The
Presidium Duo Tester with a Color Stone Estimator display
will assist users to distinguish popular colored gemstones
from each other.
The Presidium Duo Tester also comes with a built-in
reflectivity tester, providing an alternative method to identify
the gemstones being tested.
It is to be noted that natural and synthetic gemstones have
similar physical and optical properties. As such, the
Presidium Duo Tester does not distinguish between natural
and synthetic gemstones. As with all thermal testers in the
market, the tester is therefore not able to differentiate
between natural diamonds and moissanite.
The Presidium Duo Tester has been subjected to thorough
factory quality control, and will generally give a clear and
reliable reading of the gemstone being tested under proper
use. However, you are advised to conduct further
supporting tests.
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