The major factor in judging the clarity of gemstones is the variety or stone type you are dealing with. Stone varieties are grouped into those that are normally sold free of visible inclusions, and those sold with inclusions that are visible. Two good examples are Aquamarine which is normally sold eye clean and Emerald which is sold with inclusions. If Aquamarines are sold with inclusions, the material is in less demand and also less expensive. Emerald that is sold as eye clean is rarer and much more expensive.
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