Identifying Diamond Authenticity: A Guide for Home Testing

Question
how can i tell if i have a real diamond or a fake without going to a jeweler?

Answer
You can purchase a heat conductivity and an electrical conductivity tester as well as a 10X corrected loupe however the cost of these items can run you as much as 600 - 700 dollars. Even then it would be best to have expertise in using these instruments.
It's best to see a Gemologist.
Sincerely,
Arthur DeMello GG (GIA)