jewel vs ornament

jewel and ornament both are nouns.

Word	Noun	Adjective	Verb	Adverb
jewel	Yes	No	Yes	No
ornament	Yes	No	Yes	No

As verbs, ornament is a hypernym of jewel; that is, ornament is a word with a broader meaning than jewel:

Other hypernyms of jewel include adorn, beautify, decorate, embellish, grace.

jewel (noun)	ornament (noun)
a precious or semiprecious stone incorporated into a piece of jewelry	something used to beautify
a person who is as brilliant and precious as a piece of jewelry

jewel (verb)	ornament (verb)
adorn or decorate with precious stones	make more attractive by adding ornament, colour, etc.
	be an ornament to