It really depends. Most shops won't buy gold plated items (unless it is something like gold plated silver) because there really is no demand and the amount of gold on there is very, very, very tiny. On the other hand, if it is something of nice workmanship or an antique, they might buy it for the antique value. But all pawn shops are different, what one accepts readily others might not be willing to accept, the only way to know is to go in and ask.
No, shops in Dublin only accept Euro but you can use UK credit cards etc
Expensive Jewellry shops etc.
shops
Australian Dollars ($AUD). It would be very unusual for a shop to accept other currency, perhaps tourist shops or airport shops may accept USD, EUR or GBP.
Usually places like Diva or little kind of "mystical" shops will have them, $2 shops or shops with like tarot cards.
Yes
No,only Rubles.
you just have to call and ask
There are some places in France where shops still accept French francs, but not for much longer.
No, pawnshops accept older things like antiques or famous antique items
Novelty stores and joke shops
Try gun shops, gun shows or egunparts.