Tours de force (4)

I think it could be either:

Which length description are you looking for?:

gems

'tours de force' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for gems that I've seen before include "Jewels" , "Valuable stones" , "Precious stones" .)

I've seen this clue in the Newsday.

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