Golden stones are real tough to get an exact ID on.
The name golden stone itself is synonymous with the Perlidae family. Meaning, all Perlidae's are pretty much always called golden stones, and all golden stones fall within that family.
But there are 18 different genera, and upwards of 50 species. They are typically found together in the same locations with similar habits. But the markings do vary by species, and are fairly consistent within a species.
Sandfly's ID is about as good as I could do. He gives the family-genus, which narrows it down to 15 species.