Assertion: pocket watch's jewel | /r/HasProperty | ruby
Facets:
value: usually
type: DEGREE
value: in the best watches
type: OTHER
Source sentences:
text: The jewels used in watches are usually rubies, sapphires (which are chemically the same as rubies), garnets and diamonds.
text: Another clever design feature was the use of jewels, generally rubies, for use as bearings within the watch; reducing the drag and wear on the mechanical parts and allowing for a smoother, more accurate time-piece.
text: Jewels are ruby toroids which fit into holes in the movement's top and bottom plates.
text: In the best watches, the jewels are rubies that have been shaped and pierced to make a little bearing surface out of them.