Ether 10:7

wherefore he did obtain all his fine work; yea, even his fine gold he did cause to be refined in prison, and all manner of fine workmanship he did cause to be wrought in prison. And it came to pass that he did afflict the people with his whoredoms and abominations;

This is how he got all his fancy work done. He had his fine gold made in prison. He had all kinds of fancy things made in prison. He hurt the people with his sexual sins and wrong behavior.

That’s how he got all his luxury—even his fine gold was refined by prison labor. Every kind of skilled craftsmanship came from prisoners. He oppressed the people with his sexual immorality and other corruptions.