GGTL and NGL, two evaluation agencies, are slightly inferior to GIC and EGL in authority and popularity, but their credibility is still very high.

GIC belongs to Colombo Gemological Research Institute of Sri Lanka, ranking first in Sri Lanka Gemological Certificate. It is guaranteed by the local government of Sri Lanka. To some extent, it is equivalent to China's national inspection certificate. The second place is EGL evaluation agency, whose authority is basically the same as GIC among local jewelers. The requirements for gems are relatively high. GGTL and NGL, two evaluation agencies, are slightly inferior to GIC and EGL in authority and popularity, but their credibility is still very high.