My Gmail and Gravatar are different, and it definitely didn't pull the one from Gmail. I use that image on other sites, but not on GMail. So I think it's very

My Gmail and Gravatar are different, and it definitely didn't pull the one from Gmail. I use that image on other sites, but not on GMail. So I think it's very likely that it's just Gravatar, and all you need is an email address to pull that.