Question re stacking physical

I have relatively small amounts to put toward physical on a periodic basis. So far, I've been going with silver due to the fact I can get several ounces with the amounts I'm investing. I'd like to start getting some gold and have seen it sold in amounts as small as 1 gram. Is there any downside to buying in such small increments? Are they harder to sell, etc.? Should I save up to buy larger quantities?Thanks in advance for your thoughts and advice.