Would there be a whole lot of difference in a GIA certification vs. an EGL (i.e. would one come back an F color and the other a G)? Clearly there is some judgement, but are the generally rating principles different?If GIA is supposedly the most trusted then why would a jewler get an EGL cert vs a GIA? Because they feel they will get a better rating from EGL? And why do some jewlers not even get some stones certified? Because they are afraid of a poor rating?