Iridescent gemstones (5)

I believe the answer is:

opals

'iridescent gemstones' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for opals that I've seen before include "Milky gemstones with delicate colours" , "Iridescent gems" , "Translucent gemstones" , "Milky sparkling gemstones" , "Milky-white stones" .)

I've seen this clue in the Sydney Morning Herald.

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