Crown of Coral and Pearl by Mara Rutherford
In the village of Varenia, all girls are trained to be the most beautiful and charming, so that they may be chosen at the ceremony to marry the prince of Ilara. Nor and her identical twin sister Zadie are born undoubtedly as the most beautiful in Varenia, but a childhood incident gives Nor a small scar on her face. In a village that believes the beauty of a woman is all she has, this scar makes her damaged goods. This takes the burdens of being perfect off of her, allowing her to help her family as the village begins to suffer.