Säravärvus

Säravärvus, often translated as "sparkle color" or "luster color," is a visual phenomenon observed in certain gemstones and minerals, particularly those with a high refractive index. It describes the brilliance and intensity of the colors that appear to flash within the stone when light interacts with its facets. This effect is distinct from the inherent body color of the gemstone and is a result of light dispersion, also known as fire.

The phenomenon of säravärvus is caused by the gemstone's ability to split white light into its spectral colors. When light enters a well-cut gemstone, it is refracted and then reflected internally. As the light exits the gemstone, it undergoes further refraction, and if the gemstone has a high dispersion value, the different wavelengths of light (colors) will be separated and emerge at slightly different angles. This separation creates the flashes of color, or fire, that contribute to a gemstone's appeal.

Gemstones renowned for their säravärvus include diamonds, moissanite, and some varieties of zircon. The intensity of the säravärvus is influenced by several factors, including the gemstone's chemical composition, crystal structure, and most importantly, its cut. A precise and well-proportioned cut maximizes the opportunities for light to enter, reflect, and disperse, thereby enhancing the visual display of säravärvus. Jewelers carefully consider the cut of a gemstone to optimize its sparkle and fire.