Back in 2011, Thea Jourdan went to a secondhand shop and bought herself a brooch. "I had bought it from a junk shop for £20, so I knew it was just flashy old tat," she told the Daily Mail. Oh, how wrong she was. As it later turned out, the stone on the brooch was a topaz weighing 20 carats. And it was surrounded by 27 diamonds. Its color—a rare fiery pink known as Imperial—was once exclusively reserved for Russian royalty. The appraiser informed Thea that the actual worth of the brooch was close to £4,000. "As my discovery proves, you never know when you might stumble across a valuable gem," Thea then told the media. Who are we to disagree?