Also, none of this seven points really sway me.
1. Basically anything that's expensive has had its price inflated in some way. That doesn't make it anyone any less willing to pay the price.
2. Same as number 1. Lots of things are only expensive because they've been marketed well. Does that make them less valuable?
3. No one buys an engagement ring as an investment. Who buys an engagement ring thinking they'll be able to recuperate costs?
4. This one has merit but there has also been a lot of progress in recent years. things like these have popped up and most major jewelers are taking part. Ask where your diamond was sourced before buying. https://www.responsiblejewellery.com/
5. Don't spend more than you can afford on anything. That's just common sense.
6. The author is really missing the point here. You can make an exact replica of a famous painting but it's still a replica. There's value in authenticity.
7. Same as number 5. Also, you could say this about any major purchase.