How does Thermochromic Stone Works? The crystals respond to changes in temperature by twisting. The twisting changes their molecular structure, which alters the wavelengths of light that are absorbed or reflected. Wavelengths of light' is another way of saying color', so when the temperature of the crystals changes, so does their color. This stone is thought to enhance your metabolism. It may also help you make better-for-you food choices and stave off cravings. It even detects body temperature and releases waves that signal the body to relax muscles, regulate sleep patterns, improve blood circulation, and balance sleep and energy. OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.