Jadeite Certification: Buy Jadeite with Confidence

When buying jadeite jewelry, many buyers rely on certificates because a laboratory report is the proof of authenticity. In this blog, we explain about jadeite certificates for readers to better understand details and avoid common traps in the jadeite market.

What a Jadeite Certificate Confirms

Standard jadeite certificates focus on one key point: confirming that the material is natural jadeite (Type A / Grade A). This means the jadeite has not been chemically treated, dyed, or polymer-injected.

Certificates may also include basic details such as color, transparency, shape, and size. However, these descriptions are usually general and should not be used to judge the quality or value of the jadeite.

Authoritative Jadeite Certification Labs

In China, gemstone testing follows national standards GB/T 16552 and GB/T 16553. An authoritative certificate must include three accreditation marks:

• CMA(China Metrology Accreditation)
• CAL(Approval for Testing Laboratory)
• CNAS(China National Accreditation Service for Conformity Assessment)

Major trusted institutions include:

• NGTC (National Gemstone Testing Center)
  Directly under the Ministry of Natural Resources. The highest authority in China and the most widely recognized globally.
• GIC (Gemological Institute of China, China University of Geosciences)
  University-backed institution with strict academic standards and strong market credibility.
• GTC (Provincial Gem Testing Centers)
  Reliable regional authorities offering a balance of professionalism and accessibility.

International labs (GIA, IGI)
Commonly used for cross-border collections and high-end jewelry.

 How to Read a Jadeite Certificate

Experienced buyers usually go straight to the most important section: “Identification Result.” As long as it states Type A jadeite, Grade A, or Natural jadeite (A), it confirms the piece is genuine jadeite with no chemical treatment. This is what you should always look for first. Type B/C/B+C are all with chemical treatment and have no value.

Apart from the identification result, certificates also list a few physical properties:

• Refractive Index (~1.66)
  A typical optical property of jadeite. Most imitations cannot match this.
• Density (~3.33)
  Genuine jadeite feels dense and “heavy in hand,” unlike glass or other imitations.
• Microscopic Structure
  Natural jadeite shows a fine, interlocking fibrous crystal structure under magnification.

Steps to Verify a Certificate

To avoid fake or “borrowed” certificates, buyers can verify online as per below steps:

• Scan QR code or enter certificate number on the official website to confirm consistency.
• Check the accreditation marks, they must include CMA and CNAS.
• Check the stamp and signature, it must include clear official stamps or traceable digital signatures.
• Verify weight consistency, the recorded weight should match the actual stone within 0.01g.

Review the testing logic, be cautious if key scientific data (e.g., spectroscopy or standard gem testing indicators) are missing or vague.