What you buy a woman on her birthday depends on her personality and how close you are. There are some great options you can choose from. Customization is your best bet in this journey to make a seemingly common idea into a unique present. Here are my favorites:
Name necklaces are a safe choice for anyone, whether your girlfriend or sister. Jewelry is always appreciated, and having their name on it makes it extra special. You can definitely get a necklace with only their name on it, but if you want to go the extra mile you can opt for a model that pairs an image with the name. Your choice of image can symbolize their personality traits and show that you know them well. For instance, sun imagery is perfect for a summer child who is bubbly and nice, or a moon and stars can mean a lot to a night owl who loves stargazing.
If you already got them jewelry last year, my second option would be custom apparel. A nice hoodie or T-shirt with cool printing is both functional and thoughtful. It will remind the wearer of you every time they use it. You can customize the product based on their favorite shows, quotes, etc., to make it extra special.
If the recipient is a coworker or someone you don't know very well, a stylish leather wallet is never a bad choice. Leather is a timeless, durable material, and such a gift will please the recipient while showing how classy you are for this smart choice! Plus, these models can be personalized with the recipient's name or initials.
Last but not least, if the recipient is someone you got for a school/office Secret Santa with a budget cap, you might want to consider something small yet stylish and thoughtful, like custom leather bookmarks or keychains. Thanks to their high-quality material and craftsmanship, these options are very affordable while appearing more expensive than they actually are. You can customize these gifts with their name, initials, favorite quotes or lyrics, and more.