Here is the sample of the Chinese version of certificate, which is free.

The key factors in this certificate:

Picture & Total Mass, which confirm you that the certificate is responsible for the certain item you purchase.

A Jade in the Result Of Identification, which confirms you that the item is all natural, none treatment.

Refractive Index is 1.66, which confirm you that this item is jadeite jade instead of other gem.

Density is 3.33, also confirms you that this item is jadeite jade instead of other gem. (Please note that this character is not applicable to items with gold setting, gold bail, or made into strand.)