Crossword Genius

Stone in part of baseball playing area (7)

Ross

I believe the answer is:

diamond

I believe this is a double definition.

'stone' is the first definition.
(I know that diamond is a type of transparent gem)

'part of baseball playing area' is the second definition.
(area on a baseball field)

'in' is the link.

(Other definitions for diamond that I've seen before include "Form of carbon" , "Playing card - baseball playing-field" , "Precious stone of pure crystallized carbon" , "American pitch" , "suited one" .)

I've seen this clue in The Times.
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