There are abundant articles on the internet on Type C Jadeite Jade which describes Jade as those which has been dyed and impregnated with polymer.
The definition of Type A Jadeite Jade and Type B Jadeite Jade have been covered in my past previous posts.
Just to recap, Type A Jadeite Jade is the natural jadeite jade which has not undergone any chemical treatment, apart from some cleansing in mild acid. Wax polishing on the surface of the jade can still be considered as natural jade.
Type B Jadeite Jade has been chemically bleached to remove impurities and then impregnated with polymer.
From my point of view, Type C Jade is a triviality and is just much ado about nothing. Since some gemologists and jade specialists have hung a label onto it, it becomes an internet buzzword. For the few jade dealers and jade connoisseurs, it is almost akin to the great discovery of this century on quantum mechanics and the Einstein’s Theory of Relativity for scientists researching particle physics. Maybe they thought it is some great break-through of the last frontier of knowledge on jade. Even some reputable gem labs have posted their findings on Type C Jadeite Jade as ‘dyed and polymer impregnated’.
Now take a look at this picture, which was previously posted:
The man is ‘painting’ some dyes on the surface of the jade. Notice that all the jade bangles are still in its unpolished state so that dyes can easily seep into the minute capillary veins. Then they are being ‘baked’ under pressure with a type of polymer as the solution. The dye that is used is the same homogeneous polymer solution, except that these dyes are ‘colored’ while the solution polymer is colorless.
In all my years of experience in the jade trade, I have not seen a gem laboratory issuing a Type C Jade certificate or a jade report. In Hong Kong, the practice of most gem labs is to issue a Jade Certificate for a Type A Jadeite Jade. For Type B Jadeite Jade, only a report is issued with an FTIR chart.
For polymer impregnation into jade, the polymer used is commonly the Alkenes functional group, denoted by =C – H, with strong absorption from 3020 to 3100 cm-1. These can only be detected by the use of an equipment called the Fournier Transform InfraRed, which detects polymers in solutions and solids by Infrared Spectroscopy of Organic compounds.
Hence, there is actually no difference in Type B and Type C Jade.
Most Jade dealers, connoisseurs or jade lovers are only concerned about whether they have a Type A Jadeite Jade on hand. Nobody gives a toss about Type B or Type C Jade. Nobody bothers whether the type of polymers used for impregnation is the functional group of Alkenes, Alkanes or Alkynes. A fake is a fake is a fake.
I bought the above beautiful icy jade bangle for $1,500 from a known dealer. He swore that this was the Type A Jadeite Jade. I thought I was going to score on this one. It passed all the fundamental tests, or that was what I thought so. The more I listened to the pitch, the more I liked it. The more I ‘rubbed’ the jade, the more I felt that this was a Type A Jade. Maybe the seller was hard on money, maybe he had a lot of debts, maybe his wife was going to give birth again, all these rationalizations crossed my mind on why did he wanted to sell that beautiful piece for this price.
When I came back to my lab to check, the icy bangle was Type B Jadeite Jade. This was just another lemon I bought but unfortunately I could not even made lemonade out of it.
All I wanna do at that moment was to get hold of the seller and wringed his blady neck for selling me a fake.