Gem fusion of Pearl and Amethyst, in "Steven Universe" (4)

I believe the answer is:

opal

(Other definitions for opal that I've seen before include "Milky-white gem" , "Opaque gem" , "Translucent gemstone" , "Gem stone" , "Iridescent quartz-like stone" .)

I've seen this clue in the USA Today.

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