Ametrine is a rare variety of quartz that exhibits both purple amethyst and yellow citrine colors in a single crystal. It is believed to be formed by a geological process known as differential heating, where some parts of the crystal are exposed to higher temperatures than others. This occurs when the crystal is located near a source of heat, such as a volcanic magma chamber, and is subjected to varying degrees of heat and pressure. The resulting color zoning in the crystal is caused by the oxidation state of iron within the crystal lattice, which is influenced by temperature and other factors. The exact formation process of ametrine is not fully understood, but it is thought to occur during the growth of the crystal in the earth's crust over millions of years.

Ametrine is believed to have several metaphysical properties, including enhancing mental clarity and creativity, promoting spiritual awareness and growth, and balancing the energies of the body. It is thought to stimulate the third eye and crown chakras, promoting intuition and psychic abilities, while also grounding and stabilizing the physical body. Ametrine is said to help one overcome fear, anxiety, and negative thought patterns, while promoting positivity, self-confidence, and motivation. I