2. Look at the luster: the surface of natural jadeite has bright glass or grease luster, while the surface of treated jadeite will be dull or rubbery.
3, scratch hardness: the hardness of jade is very high. When scraping or wiping its surface with a sharp nail or knife, Cui Zhen will have a slippery feeling and will not leave any scratches; However, the treated jadeite will leave obvious scratches on its surface because its structure has been destroyed.
4. Listen to the sound: hang the jade with a rope, then tap it gently with a glass rod, and the natural jade will make a crisp and pleasant sound; The sound of dealing with knocking jade is very dull.
5, feel: natural jade heat transfer and heat dissipation is fast, stick it on the face or put it on the back of the hand, and it will feel cold in a short time; In addition, natural jadeite feels delicate and smooth, while the treated jadeite surface will have a rough feeling.
Extended data:
Identify the authenticity of jewelry and jade certificates
The first is to see if the inspection agency is legal. The state has strict qualification requirements for jewelry and jade quality appraisal institutions, and the appraisal certificate issued is only valid if it passes the review. CMA, CAL and CNAS are common in the certificate of jewelry and jade appraisal.
According to reports, CMA is a sign that the measurement certification of testing institutions is qualified, and the institutions with this sign are statutory inspection institutions. According to the relevant provisions of "People's Republic of China (PRC) Product Quality Law", the institutions engaged in social testing and inspection of products in China must be qualified by the national or provincial metrological certification management department in conjunction with the recognized institutions, and can only engage in testing and inspection activities after being established or authorized according to law.
CAL is the symbol of inspection institutions recognized by national quality inspection, and institutions with this symbol are qualified to make arbitration inspection conclusions. Having CMA mainly means that the testing personnel, testing instruments, testing basis and methods are qualified, and the premise of having CAL mark is that the measurement certification is qualified, that is, CMA qualification, and then the quality management conditions of the organization also meet the requirements.
It can be considered that the working quality and reliability of the mechanism with CAL are further improved than that with CMA only. CNAS was recognized by China National Accreditation Committee for Conformity Assessment. CNAS is a combination of CNAB, a former Chinese certification body, and CNAL, a Chinese laboratory, which supports international mutual recognition.
People's Daily Online-Experts teach you how to identify true and false jadeites.
People's Network-Experts teach you how to identify the authenticity of jewelry and jade certificates with naked eyes.