Visit one of the top gem hunting spots in the US. Go alone or with the family. A gemology-themed vacation can be fun, educational, and (maybe) profitable.
This is an explanation of the GIA's Diamond Cut Grading System complete with clear photographs demonstrating each of the grades.
Everything you need to know about diamonds from someone who isn't trying to sell you a diamond. Advise on how to choose a diamond and evaluate the 4Cs.