What characteristic best describes Type C jadeite?

Type C jadeite is characterized primarily by its treatment process, which often involves dyeing and can include bleaching as well as the impregnation of the stone with wax or polymers. This treatment enhances the appearance of the jadeite, often intensifying its color, but may also compromise its natural qualities. The use of these treatments distinguishes Type C jadeite from other classifications of jadeite, such as Type A, which is untreated, and Type B, which is dyed but not waxed or impregnated.

The other descriptions do not accurately reflect the characteristics of Type C jadeite. For example, completely untreated natural jadeite would fall into a different category, specifically Type A. The notion that Type C jadeite can only be found in certain colors or that it only involves surface treatments also does not capture the breadth of treatment methods associated with Type C. Understanding these distinctions is crucial for identification and valuation within the gemological field.