Tourmaline (dravite) crystal exhibiting the Usambara effect from Nchongo, Umba Valley, Tanzania. Usambara color change is different from "alexandrite effect," which is color change dependent on type of light.
Titanium Aura is quartz that is permanently treated by fusing titanium crystals with heat to give it its gorgeous rainbow coloring. Each geode piece sold individually. Buy this for me and I'll love you forever tbh