What'is jade made of?
What's the miner type of jade?
How hard are jade gems?
How can I tell if I am buying a Type A jade in the market?
If the seller cannot guarantee it is Type A Jade in writing or a certificate issued by authorized institute, most likely they are not a Type A Jade, no matter what they say.
They said that they are selling "Real Jade", does it mean that they are selling Type A jade?
May be or may be not. Treated jade (Type B jade) is still 100% real jade with 100% natural color. It is just not Type A jade because it has been artificial treated.