appraisin appraise domain tld extention

Ok, I know my question may be complicated or not very clear, but I hope you understand my point and answer me .. Are there a rule or a most trusted way to valuate the same domain name but with different extentions compared to the .com price? Example: domain.com / domain.net / domain.org /...

Ok, I know my question may be complicated or not very clear, but I hope you understand my point and answer me .. Are there a rule or a most trusted way to valuate the same domain name but with different extentions compared to the .com price? Example: domain.com / domain.net / domain.org /...