A surge in diamond demand that began in the early Covid lockdowns is showing no sign of easing, and now even the cheapest, smallest stones are getting caught up in a buying frenzy. Low-end diamonds — the sort that you might find in jewellery displayed in a local WalMart — has been a tough business for most of the last decade. There’s been an oversupply of cheaper stones, which tend to be small and flawed, and anaemic demand growth kept prices depressed and profit margins thin.