Is it permitted to have a manicure during the 9 days?
Cutting nails, which would include having a manicure, during the week of Tisha B’av is controversial, however from Rosh Chodesh Av until the week of Tisha B’av it is permitted even for Ashkenazim. This year (2021) since Tisha B’av is on Sunday, essentially there is no “week of Tisha B’av”, as there are no days during the actual week of Tisha B’av before the fast occurs. Therefore, this year it is permitted to cut nails according to everyone, and the manicure is permitted.
Aruch Hashulchan 551-32, Kitzur Shulchan Aruch 122-5, Shoneh Halachos 551-9, Kovetz Halachos ( Bein Hamitzarim) 6-15, Mesores Moshe 2 O:CH – 267.