Good gifts for a woman on her 21st birthday are jewelry, a gift card to her favorite store or a card with $21. Additional ideas are taking her out to someplace nice or making a collage of things about her. Other ideas are personalized shot glasses or wine glasses, a book about her life story and a flask with a personal message. Finally, an engraved frame or frames with engravings on them is a nice gift.
A piece of jewelry, such as a necklace, bracelet or a watch, makes for a good gift for a woman, while a gift card to a favorite store works for an indecisive gift giver who doesn't know what to get. A Hallmark card with $21 works for the gift giver who does not have a lot of time to shop for a gift.
Taking a girl out can be a special treat, especially if the event is a surprise. A collage is something personal to give a girl that shows off creativity. A possible way to acknowledge her 21st birthday is to include 21 memories about her.
Pictures may also be incorporated into something such as a photo frame keepsake box. Such a box can hold five photographs in it, and allows for an inscription of important names or dates on the frame.