Stones

20 clues
Gems
Rocks
Pits.
Cojones
Pebbles
Cobbles
Boulders
Diamonds?
Fruit parts
Ring things
Cameos, e.g.
Ring features
Setting items
Things to skip
They're the pits
Lapidary's wares
Building material
Some are precious
Building materials
They may be precious
Similar answers:
Abalones
Abalonesandwich
Abandononespost
Abedtimestory
Aborigines
Aboveoneself
Abroomofonesown
Aburglarstoleit
Abusinessaffair
Abusiveness
Acastofthousands
Accustom
Accustomed
Accustomedw
Accustoms
Acetones
Aceuponessleeve
Achenes
Achestoftreasure
Achieveonesgoal