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The Clue

Opalescent gems (10 letter answer)

The Answer

MOONSTONES

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Notes

The answer MOONSTONES is so rare that it appears less than once every 2500 puzzles.

Related Clues

Heavenly gems?

Definition

MOONSTONE as a noun:

1. a transparent or translucent gemstone with a pearly luster; some specimens are orthoclase feldspar and others are plagioclase feldspar