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.
Clarity Refers To The Inclusions
Emeralds typically contain inclusions that are visible to the unaided eye. Because of this, trade members and some consumers understand and accept the presence of inclusions in emeralds. Eye-clean emeralds are especially valuable because they’re so rare.
Carat Weight Allows For Precise Measurements
Fashioned emeralds come in a wide range of sizes. There are emeralds in museums and private collections that weigh hundreds of carats. At the other extreme are tiny emeralds that weigh fractions of a carat. Quality-for-quality, the price of emerald can rise dramatically as the size increases.