Laser Inscription quickly identifies a diamond and is included with almost all GCAL Guaranteed Grading Certificates. GCAL certified diamonds are laser inscribed with the corresponding certificate number. Photomicrographs, captured at more than 50x magnification, are printed on GCAL Guaranteed Certificates.
How it works:
GCAL uses a sophisticated IR laser technology specially designed for inscribing gemstones. When this laser is focused on a diamond’s surface, it graphitizes a microscopic mark. A continuous series of these marks produces the numbers and letters you see on the girdle.
The laser inscription mark is extremely shallow, only about 2-5 microns deep, less than one-tenth the width of the average human hair.