Type C Jadeite is a type of jadeite that has undergone chemical treatment to improve its color and texture. This treatment involves impregnating the jadeite with a polymer resin under high pressure and high temperature. This process fills in any cracks and enhances the translucency and color of the jadeite.
Type C jadeite is considered to be of lower quality than natural jadeite because it is not a natural state of the stone, and the treatment can make it more prone to damage and discoloration over time. It is also worth noting that the treatment process is not always disclosed to buyers, which can lead to misunderstandings and misrepresentations in the market.
In general, if you are interested in purchasing jadeite, it is recommended to seek out a reputable dealer who can provide information on the stone's origin, quality, and treatment history.