Diamonds, viewed as a scam, is pretty much the norm no? Resale is a joke, and De Beers have held an effective global monopoly for decades. Given this, how are

Diamonds, viewed as a scam, is pretty much the norm no? Resale is a joke, and De Beers have held an effective global monopoly for decades. Given this, how are they "losing their allure...." what allure?