Gift for Stepmom

I’m getting married at the home of my dad and stepmom. She has been so sweet and helpful during the planning of the wedding. I bought my dad a nice gift, but am at a loss for what to get for her. This would be to give her on the day of the wedding. My mother passed away 3 years ago, so I don’t want to give her a traditional mother’s gift. She is a jewelry designer, so I’d rather not give her jewelry. We plan to give them a gift card for a really nice restaurant after the wedding.
Any ideas?