[Answer] “Play-of-color” refers to the rainbow of hues on what gem?

Step 1 : Introduction to the question "“Play-of-color” refers to the rainbow of hues on what gem?"

...No two opals are the same. Light refracted by silica spheres in the stone creates a kaleidoscope of color, called “play-of-color.” Sometimes fine opals are cut irregularly to highlight the range in the play-of-color. Opals have been valued throughout history — the Romans believed they were the most precious gemstones of all, and the Bedouins believed that the stones contained lightning and fell from the sky during storms.

Step 2 : Answer to the question "“Play-of-color” refers to the rainbow of hues on what gem?"

Opal:

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