• I have bad signal so I can’t find the sources for you, but if you look up something like “diamonds artificial supply limiting” you should find it.

    Basically the diamond industry has a stranglehold on the supply of natural diamonds (which are also notoriously mined under horrid conditions - i.e. “blood diamonds”) and they artifitially alter the supply/demand ratio by limiting what goes onto market to jack up the price. Naturally, diamonds are actually a very common gemstone, and they can be easily created in a lab. They’re just hyper-compressed carbon, after all, and carbon is abundant on earth. Rubys, sapphires, and the like are much naturally rarer, but don’t fetch as high a price because of the market manipulation around diamonds.

    • which are also notoriously mined under horrid conditions - i.e. “blood diamonds”

      Not only are blood diamonds mined under bad conditions, they are mined in mines owned/controlled by insurgents and terrorist groups, and then the sale of these diamonds is used to fund the activities of these groups. Watchdog organizations are a lot more careful about blood diamonds these days than they were 20 years ago, but it’s still possible to accidentally get ahold of one. That’s why it’s so bad to buy one and it’s why people all over the world made a fuss about them back around 2000 - 2003, because buying one directly funds atrocities in central Africa. They’re usually sold cheaper than the monopolized diamonds too.