Women's perfume gift recommendations

My close friend's birthday is coming up soon, and I'm debating whether to buy them perfume as a gift. Birthdays are supposed to be a surprise, aren't they? Their birthday is in August, and I heard my friend loves perfume. Please recommend a perfume with a pleasant scent that lasts a long time, with a subtle fragrance. It seemed like my friend uses a wide variety of perfumes without much distinction. Please recommend some really good perfumes that you have tried and truly loved.