During 1930’s US gov forced gold owners to sell their gold to US gov. It did not include personal jewelry, religious icons and historical coins. If those items were made illegal, then all jewelry stores will go out of business, churches must turn over their crosses and museums must close their coin displays. The reason FDR seized the gold because the well to do converted their paper certificates into gold bullion and were shipping it out of the US. Since our money was backed by gold that was not good for the US financially, so the feds stepped in and put a stop to that by forcing US citizens to turn in their gold certificates for federal reserve notes, US gold coins, and gold bullion and be paid at $ 16 per ounce.
Today our money is not backed by gold. It would have to be a drastic reason to take privately owned gold without compensation. Majority of the gold is owned by central banks and not private citizens.
“Drastic Decision”
It would be theft. Armed robbery. I would hope people would resist by all means.