Jade appraisal institutions mainly carry out instrument appraisal according to the appraisal standards formulated by the state, and then judge whether the identified jade is natural jade A goods.
General appraisal items include density detection (3.33 ~ 3.34 is normal), refractive index (1.66 is normal), magnification inspection, infrared spectrum analysis, etc. And will be clearly marked on the appraisal certificate.