Gold is much easier to counterfeit. You can have wolfram-lead bars coated with a thin gold outer layer, by weight they would be the same if mixed correctly.
Only a specialist with ultrasound can detect the scam. Of course if you buy the gold from a reputable dealer the chances of getting scammer is low.
But if you buy it from a shady local dealer, then it might happen. Thousands of people get scammed by this worldwide.
You seem to be very unfamiliar with the gold trade. If you buy gold in "bulk", i.e. non-standardized gold bars, and from a shady source, you can always drill the gold ingot. Gold is soft while tungsten is one of the hardest metals out there (twice as hard as steel), and you would need a special drill bit to do the trick (that is, to drill through a tungsten bar)...
Well you dont wanna drill a hole in all bars, especially not before you buy them, nobody will drill a hole in their bars just for demonstration, to ruin it.
Its easier with an ultrasound machine to check its density, but not many people come equipped with that, especially if you buy a "gold" ring that is actually some cheap mix coated with gold.