Indeed, but just as Keynes warned that markets can be irrational longer than you can be solvent, women have been thoroughly indoctrinated by De Beers and it's hard to buck the trend.
From this with MFD values it is (not) sensible to say these people want a divorce and seriously don't want to keep the ring and disappointed at the prices they got.
From this it is (an even shakier prediction) to say these were asked to (or tasked with) buy a diamond ring, vehemently opposed it and wants rest of the world how to avoid it.
2012 https://news.ycombinator.com/item?id=4535611
2010 https://news.ycombinator.com/item?id=1405698
2010 https://news.ycombinator.com/item?id=1110283
Diamonds are Bullshit:
2018 https://news.ycombinator.com/item?id=17184539
2015 https://news.ycombinator.com/item?id=9251952
2013 https://news.ycombinator.com/item?id=5403988
Diamonds Suck:
2018 https://news.ycombinator.com/item?id=17186457
2016 https://news.ycombinator.com/item?id=12944464
Another one from 2010: https://news.ycombinator.com/item?id=1109318
Diamond threads are forever.