It is not recommended to use fire to distinguish pearls, especially precious jewels, which may not be restored if not handled properly. Even if it can be recovered, there is no trace on the surface, but it also has some damage to the epidermis. If the fire lasts for a long time, it can't be saved. Generally, if the fire lasts for a short time, the dust on the surface can be wiped off. If the ashes can't be erased, there is no cure. Keep pearls away from fire sources. I hope I can help you. I hope it can be adopted. Thank you!