If you're a member of the royal family, nail polish isn't off limits — thought it does have to be within a certain color range. This royal nail polish rule applies to all members of the family, so you'll never see Queen Elizabeth sporting a hot pink or deep red polish, even if she's on vacation. In fact, Queen Elizabeth's nail polish of choice is Ballet Slippers from Essie (a barely-there pink), and has been for almost 30 years! And you can easily copy her manicure at home, because a bottle only costs about $9.
Kate Middleton's nail polish at her wedding was a custom shade made by her manicurist, Marina Sandoval. Sandoval told Daily Mail that she mixed Essie's Allure nail polish with a Bourjois polish called Rose Lounge to create Kate Middleton's wedding nail color.