Natural crystals are mineral formations that develop deep within the Earth's crust over millions or even billions of years under conditions of high temperature and pressure. Their primary component is silicon dioxide (SiO₂).

Every natural crystal is unique. As they form, they incorporate trace elements (like iron, manganese, or titanium), which gives them a vast array of colors and shapes. Inclusions and internal patterns are natural birthmarks from their formation, not flaws.

Crystals primarily work through psychological suggestion. When people are open to believing in their effects, they subconsciously adjust their emotions and mindset, thereby experiencing relaxation or improved mood. Their rich colors and natural textures—such as the softness of rose quartz or the clarity of clear quartz—directly evoke feelings of calm or focus through sensory experience. Many regard crystals as tangible symbols of intention, for example, placing citrine on a desk to remind themselves to maintain a positive attitude. Furthermore, various cultures have endowed crystals with symbolic meanings like peace and protection, further strengthening their comforting effect on a psychological level. Essentially, crystals rely not on supernatural power but on self-suggestion and intentional focus, helping people better manage emotions and act on their intentions.