How to Read a Jade Certificate and Verify It
How to read a jade certificate: what the report number proves, what natural and treated mean, and how to verify the laboratory before you buy.
A jade certificate is a laboratory\u2019s statement about a specific piece: its material, whether it is natural or treated, and its report number. Read those three fields first, and always verify the number on the laboratory\u2019s own website before paying.
The three fields that matter
First, the material: the report should name nephrite (or jadeite, for that stone) rather than just "jade". Second, the treatment note: natural, or a named treatment such as dyeing or polymer impregnation. Third, the report number, which links the paper to a database entry.
Weight and dimensions on the certificate should match the piece in your hand. A certificate for a different stone proves nothing.
Natural, treated and waxed
Natural means the stone has not been dyed, bleached or filled. Waxing — a light protective polish of the surface — is a traditional, accepted finish and is disclosed separately from dyeing or filling, which change the stone itself.
A treated piece is not automatically worthless, but it must be priced and described as treated. Paying natural prices for treated stone is the most common certificate-related mistake.
Verify the laboratory
Enter the report number on the laboratory\u2019s own website and compare the entry with your piece. Reputable Chinese laboratories — such as national and provincial gem testing centres — publish databases that are easy to check.
Be wary of certificates that are only a glossy card with no issuing body, no verifiable number, or a website that does not exist.
What a certificate does not say
A certificate confirms material and treatment; it is not a grade, a valuation or a promise of origin. Two certified natural pieces can still differ enormously in quality and price.
Use the certificate as the floor of your evidence, then judge the stone itself with daylight photographs and the seller\u2019s answers.
This guide is general buying education. It is not an independent laboratory report or an appraisal. Confirm the facts of the individual piece before payment.
Frequently Asked Questions
What does natural mean on a jade certificate?
Natural means the stone has not been dyed, bleached or filled. Surface waxing is a traditional finish and is disclosed separately from treatments that change the stone.
What is treated jade?
Treated jade has been altered — most often dyed for colour, or polymer-impregnated to improve appearance. Treated pieces are legitimate when disclosed, but they should never be sold at natural prices.
How do I verify a jade certificate?
Enter the report number on the issuing laboratory\u2019s website and compare the entry — material, treatment, weight and dimensions — with the piece in your hand.
Does a certificate prove the value of jade?
No. It proves material and treatment. Quality factors such as whiteness, texture and carving still decide value, so judge the stone itself as well.