Yes, a weapon's appearance generally changes when you ascend them or even refine them. Most of the time, the weapons have a dull look when you obtain them. As you proceed through different ascension phases, the weapon's look will become brighter and more vibrant colors. I love small details game offers when you invest in your characters or weapons. Moreover, you'll be ascending and refining long-term weapons, so it's better to invest in your characters and weapons together.