Green gem in "Sonic the Hedgehog" games (7)

I believe the answer is:

emerald

(Other definitions for emerald that I've seen before include "Ireland is often called The .......Isle" , "Highly-valued variety of beryl" , "Gem associated with Ireland" , "...re medal? (Anag)" , "Led mare (anag.)" .)

I've seen this clue in the Universal.

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