Hetian jade certificate has no seal.
It's fake. The state has very strict requirements on the qualification of quality appraisal institutions for jewelry and hetian jade, and only the appraisal certificate issued by the recognized appraisal institution is valid. Hetian jade is one of the "Four Famous Jade in China" (the third place is lantian jade in Shaanxi, Xiuyu in Liaoning and dushan jade in Henan).