think you can buy a pair of exquisite couple rings. You can buy silver ones if you are cheaper, or gold or platinum ones if you are more expensive. This kind of gift can not only express your deep love for your girlfriend, but also show your affection to your friends and relatives.
You can also give your girlfriend a bag. Women usually like bags and other things. You can also give your girlfriend cosmetics, such as perfume, which is a good choice.
By the way, commemorative customized gifts and accessories are very popular now. You can also consider it. For example, you can customize two clothes, cups, pillows, or mobile phone chains with your intimate photos. This kind of gift can show that you are more attentive. Finally, I hope you will love each other and grow old together.