Recently, the Ruili Laboratory of the National Gem and Jewelry Testing Center (NGTC) discovered that some African emeralds submitted for testing had undergone film-coating treatment during its routine inspection work.

It is reported that the Ruili Laboratory of the National Gem and Jewelry Testing Center (NGTC) recently received a batch of African emerald samples submitted from the local market for testing. During the routine inspection process, technicians used a gemological microscope to examine the samples at high magnification and noticed that some of the samples exhibited an unusual luster on their surfaces—a feature that clearly differed from the characteristics typically associated with natural African emeralds. To further verify the findings, the laboratory immediately conducted an in-depth analysis of the samples using an infrared spectroscope. The results revealed that the surfaces of these samples were coated with an extremely thin film-like substance. Preliminary assessment indicated that this substance was the result of a coating treatment. As the testing continued, technicians ultimately confirmed that the submitted samples had indeed undergone a coating treatment.

The Ruili Laboratory of the National Gem & Jewelry Testing Center (NGTC) will continue to closely monitor market developments, intensify its testing efforts, and uphold order in the local jewelry and jade market. At the same time, we would like to remind consumers to purchase jewelry and jade products only through legitimate channels, request sales receipts, and obtain certificates issued by testing institutions that meet the national requirements for laboratory qualification management, thereby safeguarding their own rights and interests.