Tmark's independent code contains four "T's", which looks like the octahedron shape of a diamond and is located in the center of the table.
The imprint adopts unique technology, which is harmless to diamonds and can only be viewed under 150 times electron optical viewing mirror.
T-mark is only five nanometers in size, which is equivalent to 1/20000 of the thickness of human fingerprint, and can perfectly present the fire color and brightness of diamonds.