I agree that this is a good thing though.
They created an engagement ring tradition so strong & embedded people assume that it's traditional... Out of thin air. They were able to create a "suggested price" of 3 months salary! Can you think of anything else like that? They got Marilyn Monroe to sing their jingle, one of the most iconic pop songs ever. They were able to label all competition as "fake," or fraud. Truly amazing.
One of my favorite Priceonomics Articles - "Diamonds a re Bullshit" [0]. Previous discussions on HN [1,2]. Also, previous discussion on "Lab-Grown Diamonds" [3].
There are some cheap alternatives to diamonds like Moissanite. Here's a nice overview [4]. Also, discussed previously on HN [5].
[0] https://priceonomics.com/post/45768546804/diamonds-are-bulls...
[1] https://news.ycombinator.com/item?id=5403988
[2] https://news.ycombinator.com/item?id=9251952
⇒ If there is a large price correction, something else will replace diamonds (what that something will be is anybody’s guess)
De Beers knows that, but wants to stay in the game, so they market “made by nature” as a pre of ‘real’ diamonds.