People who don't understand say it's not pure and true. The country is still very strict about this. It is impossible to go to the counter without purity. PT950 is about 500 grams now. Jade products are not divided into brands. Every brand of jade products has advantages and disadvantages. Every jade article has a certificate. It is true that people who don't understand say that certificates are useless, but the authority of certificates is different. The most authoritative certificate in China is NGTC certificate (National Jewelry Quality Supervision and Inspection Center). Secondly, GJC (National Light Industry Jewelry Quality Supervision and Inspection Center), generally, Beijing's certificates are more credible, like Shenzhen's, which are all useless. Small appraisal institutions can do it if they have money.