Emerald values are typically based on the color and clarity of the stone.
Color
Unlike some stones, the color of an emerald cannot be precisely defined. Emeralds may be a blue-green or just green color, but the most valuable color for an emerald is typically a blue-green. Stones with some brown or yellow coloring or hues will not be considered as valuable. When searching for that perfect emerald, you want the color to be uniform throughout the stone. However, since there isn’t one true color that an emerald must be, you can also look for a ring that works best for you and appeals to you personally.
Inclusions
While some inclusions may be expected and often do not detract from the brilliance of an emerald, others may lower the value significantly. One of the most serious types of inclusions is a feather. Feathers are fractures that may be found deep within the stone and could cause the stone to break more easily. Very minor inclusions may not be visible in deeper-colored stones.
Transparency
The transparency of an emerald can also be factored into determining the value of a particular stone. The stone be clear with a uniform color rather than cloudy. Keep in that a darker emerald will not be as transparent simply because of its color.


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