and i agree with cn's estimate.. looks to be around an 1/8th or so at most..
another good method for getting an idea of how much you have it to put the bud in a normal sandwhich bag.. an 1/8th should be about one finger deep all the way across the bottom of the bag..
1/4 should be 2 fingers deep across the bottom of the bag, etc, etc, so on and so on...
it's usually a pretty accurate way to get an idea of how much bud you're getting w/out having a scale around.. obviously, it's not precise, but you will know that you're not getting extremely ripped off..