One royal "beauty rule" Meghan stuck to during her engagement and early months of her marriage was keeping her manicure pale pink or neutral. That was until December 2018, when she wore dark — almost black — nail polish to the British Fashion Awards.
Other royals including the Duchess of Cambridge and the Queen — who has famously worn the same pale pink Essie shade for decades — adhere to this rule, although not everyone is so keen. Princess Eugenie often adds a splash of colour to her nails — she's even a fan of nail art. Maybe one day we'll see Meghan trying out one of the simple nail designs we're currently obsessing over.