The phrase 'Granny's Chips' refers to a diamond brooch valued over £50 million, known for its historical significance and connection to the late Queen Elizabeth II. The brooch features two prominent diamonds, the Cullinan III and Cullinan IV, which were gifted to the Queen by her grandmother, Queen Mary, and only worn a few times during her reign. The Cullinan diamonds, discovered in 1905, are the largest gem-quality rough diamonds ever found, originally weighing 3106 carats. Scientists estimate these diamonds formed over a billion years ago beneath the Earth's surface. Additionally, on the popular show Antiques Roadshow, a guest was surprised to learn her diamond peacock feather brooch could be valued at around £25,000, highlighting the diverse world of valuable jewelry. Both stories underline the enduring fascination with royal and historical jewelry and their significant monetary worth.