1. What is Jade?
Jade is an ornamental stone of value, beauty and rarity. The term jade is applied to two different metamorphic rocks that are made up of different silicate minerals: They are jadeite and nephrite.
2. Where does Jade come from?
Jade are produced across the globe. They come from Sin Jiang, Qinghai, Taiwan, British Columbia island, New Zealand, Russia, USA, Japan, Guatemala, Myanmar etc.
3. Where is the source of jadeite?
A few countries produce Jadeite. They are Japan, Russia, Guatemala, Northern California & Myanmar.
Only those found in Myanmar is of gemstone grade.
4. How Jadeite Jade was formed?
It crystallizes at pressure of 11-17kbar and temperature of 200-400°C corresponding to the depths of 30-60km in the mantle. High pressure and low temperature formation.
5. What is Jadeite?
A pyroxene mineral consisting of silicate of sodium and aluminium, occurring in the form of light green monoclinic crystals. It is the tougher and more highly prized variety of jade.
6. What is the chemical composition of Jadeite?
Sodium Aluminum Silicate (NaAlSi2O6)
7. What is the hardness of Jadeite?
6.5 to 7 ( Mohs’ scale )
8. What is the specific gravity of Jadeite?
3.28 to 3.40
9. What is the Refractive index of Jadeite?
1.65 to 1.66
10. What are the colours of Jadeite?
Red, Yellow, Green, Lavender, Black, White.
11. What is Icy Jadeite Jade?
Colourless and very transparent to semi-translucent jadeite jade.
12. Is there any stones that are resembled to Jadeite?
Yes, they are known as Jade-like minerals and simulants.
13. What are the type of Jadeite-like minerals and simulants?
a. Serpentine Jade( Xiuyuan Jade, South Jade, Qilian Jade )
b. Aventurine Jade ( Indian Jade )
c. Australlian Jade ( Chrysoprase)
d. Malaysian Jade ( Dyed Quartzite )
e. Dushan Jade ( Saussurite )
f. Water Mill Stone ( Albite Jade )
g. Green Grossular Garnet
14. Why are there Jadeite-like minerals and simulants in market?
Because Jadeite is so valuable and so rare. Over the years, dishonest businessmen have subsitituted it with other types of natural “jade” and with artificial glasses that superficially resemble jadeite jade.
15. What are the different type of Jadeite you can find in market?
a. Type A
b. Type B
c. Type B+C
d. Type C
e. Type D
16. What is “Type A” jadeite?
Natural jadeite jade without undergoing any artificial treatment, alternation or enhancement. Natural jadeite does not change with the passage of time. It can be preserved forever and wear well.
17. What is “Type B” jadeite?
Natural jadeite having undergone a process of acid treatment, removed the impurities and impregnated with colloidal silica or resin. Normally, this kind of jadeite will turn out yellow gradually in 3-5 years of time and then the surface colour will come off due to the ageing of resin or colloid. Meanwhile, the composition of inherent texture of jadeite has been destroyed during the acid treatment which affects immediately its durability.
18. Can “Type B” jadeite be called natural jade?
No, it should be called treated jadeite.
19. Is “Type B” jadeite durable?
Some manufactures claimed that “Type B” jadeite can last for long time. Recent research found that there are less durable than “Type A” jadeite. The polymer in “Type B” jadeite will wear and tear over the years. Recent research shows that it will last for 10 years but it all depends on the type of polymer used in the manufacturing process.
20. What is “Type C” jadeite?
Natural jadeite that undergone artificial treatment, plus adding the new pigment substance. Also known as dyed jadeite.
21. What is “Type B+C” jadeite?
Jadeite that has been impregnated with colloidal silica or resin as well as dye with pigment susbstance.
22. What is “Type D” jadeite jade?
A thin form of jadeite jade that can be as thin as a piece of paper, with resin fills up from behind to improve the colour and transparency. Because of the actual thickness of the jadeite jade, its so fragile. In the trade, they are known as “Egg shell ” or simply “Doublet”
23. How do I grade a jadeite?
Right now there is no common system to grade Jadeite in the market - like the 4C system used to grade the diamond. However 4C2T1V model is widely in China and Hong Kong.