Measuring the refractive index of a faceted gemstone with
a value higher than 1.81 used to be impossible or very difficult, because the
standard refractometer has a max. range of 1.81.
Once the synthetic moissanite got on the market the
jeweller got a new problem to distinguish diamant from synthetic moissanite
because these two stones gave the same reaction with a diamondtester based
on the thermal conductibility
The GEMMETER is
a very accurate instrument to check a big parcel of faceted gemstones very
For exemple a parcel of rubies mixed with garnets or glass simulants, or a parcel
aquamarine gemstones mixed with blue topaze, etc...
The GEMMETER is a
brand new and useful instrument.
Untill now the gemmological
refractometer was the primary and one of the most
powerful tools in gemstone identification. A
typical refractometer will measure the refractive index of faceted stones,
transparent to near opaque, whether loose or mounted up to an R.I. value of
The GEMMETER works as
digital infrared instrument with 2 x 16 points LCD display for meter-reading
of the refractive index up to R.I. 3.094.
can be used for a refractive index between 1.270 and 3.094
No use of refractive index liquid is necessary.
You only need a faceted gemstone with a good polished surface of min. 2 mm
The applied infrared polarizing filter provides a precise
measurement of birefringence in the same order of magnitude than the R.I. A
microprocessor searches in a data base for all
gemstones within comparable values of the measured R.I. and birefringence.
The GEMMETER works with
a 9 Volt battery. This new instrument was designed in compact size of 8 x 15
x 3 cm, also for gem buying trips.
The Database is in English or German, other languages are
available on request.
Price : € 650,-
excl. VAT and shipping