Jadelover, from a huge brand name place in Yunnan China, which shall remained unnamed except those who can read Chinese. Apparently it is a very well known shop that only sell As and trots out government certs. Most of the online reviews say they are indeed Grade A, but i am not sure. I also found an online review by a local Chinese buyer, and his story also gives some insights about this shop and how certs are done in China:
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TRANSLATION:
My office organised a trip to Yunnan. Our tour guide said [this shop] sells only grade A. My colleague, whose son was born recently, decided to buy a pendant for RMB5800. Tour guide then brings us to another jade-related place, saying this is the place where all certs are issued. My colleague then showed one of the testers his jade piece. The guy checked using magnifying glasses and put it under lights etc, and then declared "This is a B. I have been a tester for a while, this much I can tell." My colleague was shocked and said, I bought it from [this shop], I thought they sell only Grade A?" The tester was speechless. Another tester near him then came over and said, "Maybe we ask another senior tester for his opinion, maybe we are not as experienced." They then went behind closed curtains to talk, and when they returned, an older tester stamped and signed the cert, declaring "This is an A". We went away laughing.