Not direcly, but through the market.

gen is right, you may place an item that is not already being sold at the market, onto the market for a large sum of money with you poor character. Then, with your rich digger, buy the item which will then give the money to you poor character.
you can do this multiple times with multiples of items.

jb

Thanks - that's where I was headed next. Which items have you found to work well for this trick?

ElGuapoPelirojo

Maybe a treasure from the balloon... put it up for 250 silvers, then buy it w/ another character. Then have that character put it up for over 100%

Try items you can buy from the store.  Maps, fodder, crowbars, etc.  They tend to be relatively rare on the market, making it easy to sell the item at a high price without a bunch of lower priced items getting in the way.

Sandy

ummm is it good if you make 45k in or less than 30 minutes because I think that digging suits me the best

I use an item on the market that was made just for that purpose.  I can transfer about 200K at a time without losing any money should someone buy it at the low point.  

If that's the sort of amount you'd like to transfer I will loan it to you (sell it to you and then buy it back at the same price when you're done).  Let me know if you want to do that.