Ok not gold and I hope I'm not taking this thread off the track too much.
Back in '03 I went and worked at Roxby and stayed at Andamooka where in shop a guy said he had a 30K one. I asked him well can I go get my chipping hammer to see if this is a fake. I got told if I dented the sample I would be liable so I smacked anyway. My gold pick just embedded into it showing it was a fake. The ensuring fight made the papers and the whole shutdown crew got into the melee. We turned that town upside down over night with the shonks and when I went back a year after I didn't have to pay for beers. As all the shonks had gone after we ran out the major one.
So if you see a fake just grab your pick and have a go
Cheers RuddyCrazy