Prince of Spires
Istar
It's marketing, as it is with pretty much anything that isn't directly related to primary human needs. We've decided that they're worth X, and that they are valuable, so we treat them as such. It's also culturally determined. Some countries prefer articial diamonds over mined ones because they tend to be bigger, while others consider the "it's real" factor of mined ones higher.I find gemstones fascinating mainly because I never really understood the reason such value is put on them.