Iridescent stone

Answer:

OPAL

Hint:

This gem is often associated with October births and can display a play of colors that shifts with the angle of light.

Explanation:

The clue "Iridescent stone" points to opal because opals are famous for their shimmering, rainbow-like play of colors. The word "iridescent" directly describes this unique optical effect, where light bends and reflects in shifting hues. No wordplay is involved—it’s a straightforward definition matching the gemstone’s most distinctive trait.

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General solving tip

Match the clue's grammar: plural with plural, past with past. If the clue ends in 's' or uses a past-tense verb, mirror that form in the entry.

More tips → General Hints