The Japanese invented the Firescope in 1984 after
7 years of research together with a team of inventors,
gemologists, optics specialists, physicists and
The device assesses the brilliance of a diamond
and also offers a qualitative assessment of symmetry.
It has a white light source beneath a tray
that holds the diamond in place.
Looking through the Firescope,
one can only see red-pink, black and white.