Pale green transparent variety of the olivine chrysolite, used as a gemstone (7)

I believe the answer is:

peridot

(Other definitions for peridot that I've seen before include "Gem" , "Gemstone -- pre-do it (anag)" , "mineral" , "I deport (anag) - gemstone" , "olivine" .)

I've seen this clue in The Independent.

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