“Play-of-color” refers to the rainbow of hues on what gem?
Amethyst
Citrine
Opal
Onyx
Answer: The correct answer is Opal.
Math, Math Problems and Solutions, Tests, Formulas, Algebra.
“Play-of-color” refers to the rainbow of hues on what gem?
Amethyst
Citrine
Opal
Onyx
Answer: The correct answer is Opal.