III. About your Presidium Duo Tester II (PDT II)
The Presidium Duo Tester II’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 using the principles of thermal conductivity. Dia-
monds, with their exceptional heat conductivity properties
are unlike any other simulants and are therefore not easily
replicable. The Presidium Duo Tester II (PDT II) with a Col-
or Stone Estimator display will assist users to distinguish
popular colored gemstones from each other.
The Presidium Duo Tester II (PDT II) 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 II (PDT II) does not distinguish be-
tween natural and synthetic gemstones. As with all thermal
testers in the market, the tester is therefore not able to dif-
ferentiate between natural diamonds and moissanite.
The Presidium Duo Tester II (PDT II) 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 fur-
ther supporting tests.
