Milky gems (5)

I believe the answer is:

opals

'milky gems' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for opals that I've seen before include "jewels" , "Translucent gemstones" , "Iridescent gems" , "Milky sparkling gemstones" , "Milky white and coloured gems" .)

I've seen this clue in the LA Times, the Universal, the Newsday and the King Feature Syndicate.

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