Lightning Ridge is a small mining town outside of New South Wales, Australia renowned for its black opal, which can sell for over $10,000 per carat. But even for an expert miner, finding high-quality black opal isn’t easy. After investing tens of thousands of dollars, a miner might not find a single gem. But as soon as a gem quality black opal is found, opal cutters know they have a buyer for it. That exclusivity, and black opal’s unique colors, make it one of the most expensive gemstones in the world. MORE SO EXPENSIVE VIDEOS: Why Donkey Cheese Is So Expensive | So Expensive youtube.com/watch?v=KZAp4r0n0B0 Why Ceylon Cinnamon Is So Expensive | So Expensive youtube.com/watch?v=mn6650M3M-U What Makes Blood Plasma So Expensive? | So Expensive youtube.com/watch?v=DMrMjZAF3XI ------------------------------------------------------ #BlackOpal #SoExpensive #BusinessInsider Business Insider tells you all you need to know about business, finance, tech, re...