precious stone vs jewelry

precious stone and jewelry both are nouns.

Word	Noun	Adjective	Verb	Adverb
precious stone	Yes	No	No	No
jewelry	Yes	No	No	No

As nouns, jewelry is a hypernym of precious stone; that is, jewelry is a word with a broader meaning than precious stone:

precious stone: a precious or semiprecious stone incorporated into a piece of jewelry
jewelry: an adornment (as a bracelet or ring or necklace) made of precious metals and set with gems (or imitation gems)

Other hypernyms of precious stone include jewellery.

precious stone (noun)	jewelry (noun)
a precious or semiprecious stone incorporated into a piece of jewelry	an adornment (as a bracelet or ring or necklace) made of precious metals and set with gems (or imitation gems)