Dimes are usually a gram, most people won't care if their .2 off. But sometimes you'll get 1.5g in a dime.

Who cares about dimes and nicks? You really buy those? I can see buying a dime, but a nick? .5 definitely isn't worth the hassle of calling your dealer up. I mean maybe if you just needed some real quick and your neighbor was like 'yeah come on over I got some' then I'd buy 5 dollars worth, but even in that case then I'd probably try and get more.