A type of gem (7)

I believe the answer is:

emerald

This clue is a double definition.

'a type' is the first definition.
(I've seen this before)

'gem' is the second definition.
(type of gem stone)

'of' is the link.

(Other definitions for emerald that I've seen before include "Gem associated with Ireland" , "Green - jewel" , "city in Oz?" , "Mere lad (anag.)" , "Precious green stone" .)

I've seen this clue in The Globe and Mail.

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