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The phrase "are emerald" is not correct and lacks context to be usable in written English.
It could potentially be used in a sentence describing something that has the quality or color of emeralds, but it needs additional context to make sense.
Example: "The gemstones in the necklace are emerald."
Alternatives: "are green" or "are of emerald color."
Dictionary
are emerald
noun
Any of various green gemstones, especially a green transparent form of beryl, highly valued as a precious stone.
synonyms
Exact(12)
Males are mostly emerald in coloration, while females are emerald above and gray below.
(In her unforgiving style, the woman's bruises are "emerald green tinged with blue, like badly spoiled meat").
The leaves, a random mix of basil, sage, rosemary, parsley and savory, are emerald green and glossy, fried stiff.
And to make matters worse, the little saurians are emerald green, closely matching the thick, bushy vegetation in which they live.
THE Nile-fed crops outside the Egyptian village of Abu Genshu, 100km (62 miles) southwest of the capital Cairo, are emerald green.
Church bells ring at Chapel Stile, and valley fields are emerald – a contrast to the yellow, brown and orange of rush, rough grass and bracken on surrounding fells, interspersed with scree and rocks above the tumbled walls of former enclosures.
Similar(48)
The windowsill is emerald.
It is Emerald Isle, not Emerald Island.
The water is emerald green.
There's emerald here, I know it.
The water was emerald, reflecting the trees.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com