Collocations for gem - noun

precious, priceless

encrusted with gems, studded with gems
a belt studded with priceless gems

little
absolute, real, true
The second side of their new album contains some real gems.

rare
forgotten, hidden, undiscovered
She worked in the antiques trade, searching out hidden gems in the most unlikely places.

architectural
architectural gems like the Taj Mahal

a gem of a sth
This is a gem of a show.