Red transparent variety of the mineral zircon, used as a gemstone (8)

I believe the answer is:

hyacinth

(Other definitions for hyacinth that I've seen before include "Spring-flowering bulb" , "Flower, in an achy hint" , "Bulbous house plant" , "Any hitch in the flower?" , "A bulb; any hitch? (anag.)" .)

I've seen this clue in The Independent.

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