When working with gemstones, quality assurance
is always a top priority. Extensive testing must be done to ensure the
quality of the gemstones that you buy and sell. Here we will share with you some of the techniques
and tools that will help you sell with confidence. The key instruments used to test gemstones
are a refractometer, polariscope, binocular microscope, and a ten power loupe.
Make sure the stone you are inspecting is
clean and polished. With a 10 power loupe, observe the stone for
color, transparency, cutting style, and any unusual phenomenon. Next use the refractometer to obtain a reading
on their refractive index. Be careful not to use too much liquid.
The polariscope is then used to find out if
the gem is singly or doubly refractive. This is the optic character of the gem and
will help identify the material of a stone. As you move the stone around you are looking
for any changes in light or any blinking. These findings along with the refractive index
are then compared against a gem property chart to find a match.
This will tell if the stone is spinel, corundum
barrel, etc., However testing is not complete. Using the binocular microscope look deeper
into the stone and look for any unusual characteristics that give signs of enhancements, fillings,
etc. These unique inclusions act like fingerprints
and help easily identify certain gem types. After these tests are completed you can be
almost one hundred percent certain of the gemstone and its quality..