Hi Ravi & everyone!
Telling Mossonite from any diamond is a rather simple process, but
telling syn. diamond from natural isn’t as easy.
Mossonite is strongly double refractive, while diamond is singly
refractive. In practical terms, this means that when you look at the
back facets of a diamond through it’s table (the top facet), you will
see a single set of facets junctions. If you look through a
Mossonite the same way, you will see all of the fact junctions
doubled. The strength of the doubling depends on how the Mossonite
is cut (they try to minimize this effect when cutting) and it is
easiest to see if you have some magnification (at least 10x). If the
Mossonite is well cut, you may need to look at the stone through one
of the side facets to see the doubling.
If you don’t have any Mossonite to look at, you can see the effects
of double refraction in most colored gems. However, it is strongest
and most easily seen in zircon, peridot, and calcite (especially the
’iceland spar’ variety).
As for telling synthetic diamond from natural diamond, well, this
takes quite a bit more doing. Perhaps someone more knowledgeable
than I knows of an easy way to do it. If it is essential for you
to know the origin of a diamond, you should submit the stone to a
gemological lab for a complete report.
GG in training…