It's a valid point but diamonds are definitely a bit different. Luxury fashion items are differentiated. Most of the time they don't have identical substitutes.

It's a valid point but diamonds are definitely a bit different. Luxury fashion items are differentiated. Most of the time they don't have identical substitutes. And when they do they might be hard to get and illegal. Diamonds are much more pure in how few effects make for its value. The point is - I don't think anti-diamond crusaders are being randomly selective.