Getting engaged just got 30% cheaper. It's rare that an imitation, Frankensteined into existence, is anything more than a watered-down, flimsy version of the original. Real Rolexes and Folexes. Charcuterie and "ham"-and-"cheese" Lunchables. Coke and Diet Coke. (Fight me, Diet Coke fans.) But when it comes to diamonds—items we've historically been conditioned to think of as exceptionally precious—that might not be the case. Lab-grown diamonds are exactly what they sound like: