Authenticity of an arrowhead is hard to detect, so I would never buy a "one off" arrowhead over the internet or anything like that. Professionals can identify aging under microscope, but alot of internet stuff is fake so I would avoid that. Best is if you know someone that found them on farms or if you know someone they were passed down to, then I would buy them because you know their collection is real. What makes an arrowhead great is its history and age, any made recently i would consider as garbage. Sometimes if people had entire collections in attic or garbage in a display case, then those are more likely real compared to just one off stuff on the internet made by anyone or made in china, those are just junk.