What is the difference between a diamond and an expensive handbag or other accessory? If a thing is worth what people pay, how come diamonds are a scam and other items not? I have a hard time grasping this everytime an anti-diamond article pops up. I can see the logic in not using that kind of money on a ring, but not what's so special about the price/scarcity/fashion of diamonds compared to other luxury goods.
For me the underlying principles boil down to two main ideas:
* Priorities. I personally value a great laptop over a great rug and a nice piano over a nice couch, so I will adjust my spending accordingly. This works within categories as well; I would value what the stone is/does materially over what the stone is/does culturally.
* Consider diminishing returns. When making a buying decision I look at what is available in the category and what the value for money curve looks like. A phone that costs 400 bucks is a significant upgrade over one that is 200, but adding another 200 won't bump the specs as much. This is not to say I'd never buy the more expensive stuff, but only if I prioritize it accordingly.