It's so easy to choose a birthday gift for a beautiful girl. I don't understand why you are worried. If you like beauty, you must choose all kinds of beautiful accessories or cosmetics. In addition to these things that girls like, there are also chocolates, music boxes, etc.
First, the favorite birthday gift for beautiful girls must be accessories, such as necklaces. Isn't this crystal four-leaf clover necklace very beautiful? Moreover, the names of classmates can be engraved on the leaves of the four-leaf clover, so this gift not only has blessing meaning, but also commemorative significance.
Second, or some beautiful bracelets are also OK. Girls seem to like crystals, which are pure and bling things. So I recommend you this romantic crystal bracelet in 925 silver inlaid with water blue crystals in the style of Swarovski.
Third, in addition, the 18th birthday is a very special birthday. You can choose some special or commemorative small gifts, such as chocolates that can be engraved or crystal piano music boxes that can print photos of female classmates.