You got ripped off because you don't know what it looks like. He could have gave you a dime and you wouldn't have known the different, at least you'll know what it looks like now
What are you asking? Is 1 gram enough for you or what does it look it as in weight? I gram is roughly the size of 2-3 dimes, as in 10cent pieces, put beside each other. Just go weigh it or something.
EDIT: If you told your dealer it was your first time buying, you gotted ripped off.