Yeah, of course, just saying that specific source is obviously bad.
If you're a jeweler you want to get something certified anyway. I don't think a Chinese distributor's claim of AAA-quality emeralds is worth the electrons it took to show it to me.
One thing that's worth keeping in mind is that the usual term for "emerald" in Chinese is 绿宝石, which literally means "green gem". It's understandable that they might be confused about which green gems are actually "emeralds". (That particular ad still doesn't work even if you forgive use of the word emerald, though...)
If you're a jeweler you want to get something certified anyway. I don't think a Chinese distributor's claim of AAA-quality emeralds is worth the electrons it took to show it to me.