Alexandrite is a variety of Chrysoberyl, a beryllium aluminium oxide. Natural Alexandrite is very rare, and the best types are pleochroic, meaning that it reacts differently according to the wavelength of light: thus, in daylight it can appear green, yet in evening light it can appear red. The best material is snapped up by the gem trade, but it is possible to find small triangular crystalline plates or clusters of the mineral that is less gemmy. Material that is found on / in matrix tends to appear black, and benefits from being moistened and tilted under a good light to enable one to see any colour change, which indicates the presence of any purer crystalline aspects. Alexandrite is a high-vibrational stone, and its ability to change colour suggests that it may support change of all sorts – especially where energy is required to create the impetus for change (red), followed by a period of balance and assimilation (green). The colours also support the High Heart centre, and may aid in the correction of imbalances within the three-fold flames of the heart, leading to greater awareness of the Self on may levels and all aspects of love, wisdom and power (for and of ourselves).