I'm pretty sure I'd recognize this if I found it in my pan. Clearly a diamond. But the vast majority of diamonds don't conform to what we think they should look like, any more than the vast majority of plenty of fish dates even vaguely resemble their profile pictures.

I've interspersed a few pictures of diamonds with some of the rough material I've picked from my concentrates. See if you can tell which are real diamonds and which are rod's imaginary diamonds. (perfect, by the way, for imaginary girlfriends. And at a fraction of the price of a real diamond you can celebrate your commitment to celibacy with the symbol and ceremony you deserve...).