Tone is the degree of darkness or lightness of the color in an emerald. The tonal grade scale for an emerald goes:
Very Light Light Medium Light Medium Medium Dark Very Dark
On the following pictures, you will see two round cut emeralds from Colombia with two totally different tonal grades;
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Natural colombian emerald jewelry, columbian emerald jewelry, emerald rings, emerald earrings, emerald necklaces, emerald pendants, emerald braceletes, real emeralds, genuine emeralds, high qulity emeralds, emerald engagement rings, white gold, costum emerald jewelry
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Natural colombian emerald jewelry, columbian emerald jewelry, emerald rings, emerald earrings, emerald necklaces, emerald pendants, emerald braceletes, real emeralds, genuine emeralds, high qulity emeralds, emerald engagement rings, white gold, costum emerald jewelry