Milky gems (5)
I believe the answer is:
opals
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">milky gems</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 opals that I've seen before include "jewels" , "Translucent gemstones" , "Iridescent gems" , "Milky sparkling gemstones" , "Milky white and coloured gems" .)