July birthstone (9)

I think it could be either:

Which length description are you looking for?:

ruby

'july birthstone' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ruby that I've seen before include "Precious red gem" , "Fortieth anniversary stone" , "Stony girl" , "Red precious stone" , "killed an assassin" .)

I've seen this clue in The Times, the Universal, The Sunday Times and the King Feature Syndicate.

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