When apologizing to your girlfriend, giving her a gift is secondary. The most important thing is to let your girlfriend see your sincerity with your actions and words. You have to choose carefully. You can choose a good gift for your girlfriend on some special days or holidays. The effect will be much better.
Give her a bottle of good perfume. Smell and know a woman. Girls like perfume. The smell should be selected according to your understanding of her.
You can also give her crystal. Pink crystal represents love, yellow crystal is for wealth, and amethyst represents mystery. You can also give her a string of crystal bracelets, which are available in various colors, with multiple blessings.
You can also help her choose a couple's outfit, which is very warm.
Another thing is a music box, a little romantic music, and a good apology, hehe.
Chocolate + roses, a very traditional gift, but also the most direct and simple.