At Peter Norman! Moissanite is actually silicon carbide, an incredibly rare, and therefore expensive, mineral. But the moissanite you’ll find in engagement rings is created in a lab.
Because lab-made moissanite is affordable and is a close approximation of a diamond, it’s a popular alternative. It almost begs the question: why buy synthetic moissanite to masquerade as a diamond when lab-grown diamonds are also affordable, and they’re exactly the same as the real deal?