How does briolites color grade on a diamond color scale?
A gemstone can separate light into a spectrum of colors and emit this light as fire. These colorful flashes are most prominent when the color of the stone is perfectly white. Any hint of color will act as a filter and reduce the spectrum of light which is emitted. The less color in a stone, the more colorful the flashes, and the better the color grade. Since briolite was created to be a perfectly white D color, the flashes of light are extremely colorful and pronounced. The fire in briolite is so close to that of a natural diamond, that some testing equipment designed to look for the signature fire in a diamond shows briolite as a natural stone. While some people desire fluorescence, others avoid it. This phenomenon is essentially a reaction to UV light, is graded from None to Very Strong, and can make a slightly colored stone like a diamond look whiter. Purely white stones without fluorescence, like briolite, are much more highly valued because the full spectrum of light is allowed to
