Diamonds are the shitcoins of stones. De Beers artificially controls the supply and artificially inflates the price. They are not rare (every Tom, Dick and Harry's wife has one). De Beers controls their sale. You'll never be able to resell a diamond at the original price.
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100%. Hence th4e requirement for the diamonds are forever ad campaign to dissuade people selling on the second hand market and the pushing of diamonds as engagement rings. As a geologist, I always thought that if someone wanted to invest in a precious stone, better off going for something with greater scarcity like a truly clear star saphire or ruby with little silk outside the star.
However, these are still little barometers in the unfree marketplace of fiat debt fuckery