precious stone vs jewellery

precious stone and jewellery both are nouns.

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

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

precious stone: a precious or semiprecious stone incorporated into a piece of jewelry
jewellery: 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 jewelry.

precious stone (noun)	jewellery (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)