Rock And Gem Puns

We were touring a college and walked by the geology room, it had a bunch of rocks on display.

I muttered "I bet this class rocks"

After we laugh and he punches me, I say "Aw cmon that ones a classic"

He agrees

Then I say "Yeah it was a real gem"

Scenario: Father and Daughter are sitting at the sorting table, Daughter finds a Gem.

Daughter: What kind of rock is this one dad?

Dad: That's a quartz. Find 3 more and you've got a gallon.

Daughter: Whoosh