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Jewel
The ruby is a very hard natural stone, used to make the bearings of the different mobiles of the watch and the organs of the escapement, allowing to reduce friction phenomena as much as possible. Nowadays, they are synthetic.
The ruby is a very hard natural stone, used to make the bearings of the different mobiles of the watch and the organs of the escapement, allowing to reduce friction phenomena as much as possible. Nowadays, they are synthetic.