With the help of magnifying glass, microscope and other instruments, the magnification inspection of colored gemstones is mainly to observe the internal and external characteristics of the jewels and jade. Internal features include: Bao gồm, kết cấu, kết cấu, color bands, vết bẩn, vân vân.; external features include: original crystal planes, surface scratches, ports, and open slit lamps. Magnification inspection […]
