Crossword Genius

Semiprecious gem (4)

Ross

I believe the answer is:

opal

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">semiprecious gem</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for opal that I've seen before include "raw material" , "Milky white gemstone" , "Milky stuff that's hard" , "Rock" , "One's stony" .)

I've seen this clue in The Mirror.
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