noun
a type of mineral often used in jewelry
adjective
describing a shade of gray resembling the color of agate
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The exterior of the building was painted in a sleek agate gray color.
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I love that agate gray sweater you're wearing, it looks really nice.
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That agate gray car is so cool, I wish I could afford one.
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Her eyes were a deep agate gray, reflecting the storm brewing within her.