<prompt> Human: Was approached to invest in silver with a coworker. The seller wants 17 an oz. seems fair. Ive never invested in it before and dont know if I should take part of my savings and put it into it. There in the form of eagle coins.  <response>: Sounds sketchy. I would compare the average ROI on silver in 10 years or do, to the average return on a small index fund, ETF OR MUTUAL FUND. 