Polly James' character in the sitcom The Liver Birds (5)

I believe the answer is:

beryl

(Other definitions for beryl that I've seen before include "Girl's name - precious stone" , "Transparent mineral used as a gemstone" , "Mineral, aquamarine if blue" , "Blue, green or yellow mineral, sometimes a gemstone" , "Green stone" .)

I've seen this clue in The Sun.

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