Emerald has many special qualities, but coloured stone professionals generally agree that emeralds are, primarily, about colour. Subtle variations make significant differences in value.
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What to look for
The most desirable emerald colours are bluish green to pure green, with vivid colour saturation and tone that’s not too dark. The most-prized emeralds are highly transparent. Their colour is evenly distributed, with no eye-visible colour zoning.