In 2016, jeweler Olivia Young of Ouroboros sold a red spinel ring for £6,000 ($7,700). Last year, the client’s insurance company paid out £30,000 ($38,400) to replace it. Experts say that this ...

All that glitters is certainly not gold. But all that is radiantly red is not a ruby either. A line of luminous crystals, emitting vivid colours and dazzling like a prized precious stone is catching ...