This is not Margot’s exact shade as it was not shared but it is the same brand and type. Pati shared with Allure that she gave Margot a red lip using Chanel Rouge Allure Velvet Extremê Lipstick ($37.00). It is an intense matte lip.
Thank you to @nailedbysg who shared the products they used on Margot’s nails; Chanel Le Vernis Longwear Polish in the shade 167 – Ballerina and also Chanel La Base