So apparently, someone decided to rip my diamond emblem off the back. Luckily I have a spare chrome one without the adhesive. Which kind should I cut out to put it back on?

+1 I would like to know the answer as well

go to your local autobody supply store and ask for some double sided tape for body parts. Its this dark gray foam tape.

That normal stuff SUCKS! Even the "extra strength" stuff is weak and falls off. Industrial strength is what I'm looking for.

I recommend the 3M double sided grey stuff. It does hold most OEM automobile emblems on.