I don't usualy buy things but I could not resist. $1.99 for the dish and three spoons. Un marked and a little bent. I removed the handles to find a white non magnetic metal underneath. Into the AP it goes.
Buhahahaha
Are you sure you want to waste all that acid and generate all that waste for a few pennies worth of gold? The base metal of most gold plated flatware is 410 stainless, which is magnetic. I once consulted for a company that was gold plating about 100,000 knives, forks, and spoons per day. They were applying the gold 7 millionths of an inch thick, which is fairly standard for that type stuff. I wouldn't except yours to be any thicker. At that thickness, one square inch of plating would be worth about 8 cents, when new with no wear.
If the bowl is non-magnetic, it's either 300 series stainless or a white copper alloy.