How are polish and symmetry of briolite stones speical?
The polish and symmetry of a stone also greatly affects how much the stone will shine. The polish indicates how smooth the surface of the facets are. The symmetry grade determines how well-aligned the facets of the stone are. A badly polished stone will have a dull surface, and can lead to dulled brilliance, fire and scintillation. What happens is that light is misdirected and hits a facet at the wrong place, causing its reflection to be inaccurate. Since briolite is cut by machines using very sophisticated instruments designed to measure the polish and symmetry of the stone, every ray of light is perfectly directed to reflect without lose of sparkle. This is a significant reason why briolite looks essentially identical to a natural diamond.
