The address of Shenzhen Testing Center is located on the first floor of Block B, Tianji Building, F4 8, Tianan Digital City, Futian District, Shenzhen.
The detection method is:
1, temperature change technology. The GIC logo on the front of the certificate is printed by temperature change technology. At higher temperatures (such as fire baking and lamp baking), the logo will disappear, and then it will return to its original state after the temperature drops.
2. Color-changing fluorescence. The certificate has the logo and words "GIC Jewellery Institute" in the upper right corner of the front. Shadows can be seen from the front, and red fluorescence can be clearly seen under ultraviolet rays such as money detectors.