Ruili can go, but the jade sold by Burmese people in Ruili Jewelry Street is not reliable. Many goods B and C are not recommended to be bought casually if they are not very knowledgeable experts. In contrast, there are far fewer fakes in Tengchong. Tengchong government and tourism bureau have made great efforts to solve the problem of jadeite B and C products. Usually, you won't buy B and C products in Tengchong. You can complain if you buy it, or it is ok for the merchant to show the quality inspection certificate for the jade with higher price.
I wish you a good time in Tengchong and buy jade at the right price.