While most associate sapphires with a rich shade of blue, the special stone on Princess Eugenie's engagement band is actually an orange-pink. That's not the only thing that sets the royal's ring apart, though. As POPSUGAR notes, her gem—a Padparadscha sapphire—is one of the rarest out there.
In Princess Eugenie's post-engagement interview with her fiancé, Jack Brooksbank, the groom-to-be explained how he chose the one-of-a-kind proposal piece. "What's amazing about it—why I loved it so much—is it changes color from every different angle that you look at it," he explained. He went on to share that its beauty reminds him of his future bride. According to The Natural Sapphire Company, Padparadscha sapphires are known for their unique shades. They're also "extremely rare," since there are "few natural stones available."
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That makes Princess Eugenie's engagement ring rarer than Kate Middleton's, which also contains a statement (but blue!) sapphire. Of course, Duchess Kate's isn't your average gemstone—the bauble is a family heirloom. Before it belonged to Middleton, the piece of jewelry served as Princess Diana's engagement ring from Prince Charles. It's legacy predates even the modern monarchy, though. It was inspired by a sapphire brooch Queen Victoria wore.
Obviously, there are a lot of important gems in the royal family. That includes Meghan Markle's engagement ring, which Prince Harry designed himself. Her ring features a large diamond from Botswana—where the couple had one of their milestone dates—as well as smaller diamonds from Princess Diana's collection.