Although summer is hot, it will definitely show her slender neck, so it is appropriate to give her a necklace. You can give her a good luck four-leaf clover sterling silver necklace, or other gifts. But the four-leaf clover has a good meaning. The four-leaf clover represents true love, health, reputation and happiness, so it is definitely appropriate to give it to her.
You can give her a pair of sunglasses to bring her a hint of coolness in the summer. If you go to the beach together, you can also buy her a set of swimming equipment, such as a swimsuit and swimming goggles. She will definitely like it. I believe that swimming will increase your feelings and make your love last longer.
You can also give her some small accessories, such as bracelets and necklaces made of beach shells, which will be very exotic and memorable. It is perfect to wear in the summer.