Diamond Certification | GIA, AGS, HRD, IGI, EGL, GSI, GCAL ...
Diamond Certification | GIA, AGS, HRD, IGI, EGL, GSI, GCAL, PGS ... Gemological Science International mainly grades diamonds for some of the large chain stores in mass numbers. Recently, they have expanded their operations to a number of countries worldwide. ... Don't forget to checkout our wholesale diamonds, tanzanite engagement rings ...