Emerald A, B, C and D: Emerald is mainly composed of jadeite or other pyroxene minerals (such as chromic jadeite and omphacite) in pyroxene cluster. ) and high jadeite molecule (NaAlSi2O6). Natural jadeite without chemical treatment such as filling and coloring has long been called jadeite A in the industry. Due to the scarcity and high price of high-grade (high transparency, bright green color and few defects) jade A, profiteers are driven to make fakes. After filling (usually jadeite with insufficient water head or many defects), first "wash" it with strong acid and alkali, and then fill it with polymer. ), it's called b (this "b" is mostly from the English "blended &；; Polymer impregnated jadeite "-"bleached glued jadeite "); Jade C goods (more easily understood as colored jadeite-from English dyed jadeite) are dyed jadeite, most of which are dyed lovely green, and of course some of them are dyed purple and brown; If there are both filling treatment and coloring treatment, it is called B+C goods; Coating a green film on colorless jadeite is called jadeite D. This method is only used on the face of the ring most of the time, and some people call other jadeites that pretend to be D goods jadeite. Goods A, B, C and D do not mean the "grades" of A, B, C and D, but only the identity mark indicating whether the jadeite has been "treated".
In short,
Commodity A: It has not undergone any artificial chemical treatment.
B: Pickling, bleaching and filling. The appearance of the water head is very good, indicating that the luster is rubbery, the knocking sound is dull and the price is relatively low. But good B goods are more valuable than bad A goods (don't think that A goods must be valuable, and there are also worthless bricks). Commodity b manufactured with the latest technology is very close to commodity a.
C goods: artificial dyeing, mostly directly immersed in dyes for a long time heating dyeing, sometimes need repeated heating. Note: Since it is necessary to dye, the structure of jadeite must be artificially destroyed, otherwise the dye cannot enter the interior. But this damage is not necessarily pickling.
Don't say d, don't say jade.
Gloss and transparency: the luster of jadeite is glass luster, greasy luster or greasy glass luster, and the transparency is affected by many factors such as the particle size, bonding mode, cracks and color depth of its constituent minerals. Most jadeites are translucent to opaque. Transparency is also called "water head" in the traditional jade industry and is still in use today. High transparency is called "good head" and "long head". Transparency is also an important factor to evaluate the quality of jadeite.