>Adding jewels to hidden parts of your mechanism is bound to make it more prone to failure, considerably harder to build, and with no tangible benefit. The "je

>Adding jewels to hidden parts of your mechanism is bound to make it more prone to failure, considerably harder to build, and with no tangible benefit. The "jewels" you find inside a watch movement actually do serve a purpose. They're there to reduce the friction between metal parts at the points of heaviest wear like bearings and pivots. Also, they are mostly extremely inexpensive synthetic rubies.