Turquoise stone is the stunning blue-green gemstone for December birthdays. Turquoise has captured the human imagination for thousands of years with its unique color and historical significance, so it’s no wonder this mineral is valued worldwide. But how does turquoise form? What causes its beautiful range of colors? And why do some turquoise stones look different from others? In this article, we’ll explore the step-by-step process of how turquoise stone forms in nature, the factors that influence its color and appearance, and the time it takes for this process to unfold.