This knowledge itself is very valuable as your capable to tell between real and fake, natural and synthetic lab, glass and quartz, silver and white gold, platinum and silver, Gold and brass, etc. I buy jewelry stating it's lab when it's really a natural stone all the time. I'll be teaching you what to look for and how to keep recycling your own gold. Once you can successfully study every kind of flaw there is in a stone then you can be ready to become a certified gemologist by GIA, or other gem institutions. There's many instruments used to identify jewelry but a jewelers loupe and good lighting should be enough.