What does "jewel" mean?

Additional senses

1. 2.An object regarded with special affection; a precious thing. "Our prince (jewel of children)." Shak.
2. 3.A bearing for a pivot a pivot in a watch, formed of a crystal or precious stone, as a ruby. Jewel block (Naut.), block at the extremity of a yard, through which the halyard of a studding sail is rove.
3. 4.To dress, adorn, deck, or supply with jewels, as a dress, a sword hilt, or a watch; to bespangle, as with jewels. The long gray tufts . . . are jeweled thick with dew. M. Arnold.