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All answers having "Diamond" as clue:

3 Character Answers:

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GEM

ICE

LIL

TEN



4 Character Answers:

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CARD

HOPE

LEGS

NEIL



5 Character Answers:

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FIELD

JEWEL

SELMA

SHAPE

STONE



6 Character Answers:

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CARBON



7 Character Answers:

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INFIELD

LOZENGE

REDCARD



8 Character Answers:

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SPARKLER



9 Character Answers:

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SOLITAIRE



11 Character Answers:

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PLAYINGCARD



13 Character Answers:

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BASEBALLFIELD

PRECIOUSSTONE



14 Character Answers:

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REDPLAYINGCARD

TRANSPARENTGEM



15 Character Answers:

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BASEBALLINFIELD

ENGAGEMENTSTONE

HANKAARONSVENUE

POPVOCALISTNEIL