Have passed diamonds and CS. Need Gem Ident info. Teaching self is not good enough.
diamond identification contains more information, colored stones 230 even more. To get to the actual technical use of real identification you need to complete those as well and the lab courses. After that its a quick up to two year stint to prove that you actually got it all. Some of the best refrence material comes from the course books in Colored stones 230 and Gem identification + the lab books.