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All answers having "Gemstone" as clue:

3 Character Answers:

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ORE



4 Character Answers:

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ABLE

JADE

ONYX

OPAL

RUBY

SARD



5 Character Answers:

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AGATE

BERYL

BIJOU

DREGS

LAPIS

MIGHT

STREW

TOPAZ

UNDER



6 Character Answers:

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BURDEN

DIMPLE

GARNET

MISLAY

TAURUS

ZIRCON



7 Character Answers:

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CATSEYE

CITRINE

DIAMOND

EMERALD



8 Character Answers:

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AMETHYST



9 Character Answers:

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TESTIMONY