if you think it's a nug, then it's a nug.
not sure if that was what you were looking for.
it's like the definition of "picker"...everyone has their own.
biggest I've ever found was 11 grain, which is roughly 0.7 gram. still I wouldn't call that a nug, but that's me.
BTW, a picker for me is anything I don't have to struggle to pick out of a pan..if I can grab it with thumb and forefinger without a fuss, it's a picker.
still, your "piece" is purdy, must not have travelled very far from the source.