Gemstones used as ornaments have captivated cultures worldwide throughout the ages. Their enchantment stems from the manner in which they interact with light, showcasing a spectrum of colors and unexpected bursts of brilliance as they shift under various angles. Ultimately, these characteristics are influenced by the presence or lack of specific trace elements, the stone's geological history, and its interactions with people over time. This presentation will provide an overview of the methods used to carry out the physicochemical analysis of gemstones. In conclusion, I will discuss the captivating tanzanite, showing the latest scientific findings that explain the properties and mystique of this stunning gem.