In 1960 we attained the domestic
manufacture for Watch Jewels for the first time in Japan.
Watch Jewels are mainly made from Ruby Material. The Ruby
is hard to grind and has a highly wear resistance. However,
the Ruby Chips grind easily because it is a single crystal.
The grinding and polishing of Ruby was very difficult.
Artificial Rubies are also used for Watch Jewels. The inscription
of “17 J” or “17 Jewel” on a watch dial is an indication of
the jewel number in the watch.
Pallet Forks in mechanical watches have two roles; One role
is transmitting power to balance and the other is controlling
the motion of the escape wheel according to the Metronomic
Swing of Balance.
The Pallet Jewels are Brick Shaped Jewels on the Pallet Fork
that alternately engage and release the Escape Wheel.
