This is yet another reason why bitcoin will eventually take a lot of the money currently parked in gold:
(Source: https://twitter.com/renanpfaria/status/1098570251304878090)
Tungstin plugs in the middle of the gold bar.
They have almost exactly the same density and weight as a pure gold bar.
Difficult to detect if done well.
How many of these are out there in circulation?
It's time for a change...
Gold worked as a store of value for thousands of years.
Until something better came along.
That something better is bitcoin.
It can't be counterfit.
And the supply will never increase beyond the 21 million coins.