While I HATE to say it...
....and HATE to do it, some things HAVE to be washed by hand! The gold is an overlay or hand painted on, and there is no protectant on top of it, so it would surely come off. It may not come off after the first washing, but you would surely notice the wear. I'll never forget a Versace ad that had his beautiful plates and stemware in the dishwasher. The glasses are so fragile that all you have to do is look at them and the stems break off! (I have a service for 12, so I know) And they certainly CAN NOT be machine washed. Mark