roundshining

Roundshining is a term used in gemology to describe a specific method of polishing gemstones. It refers to the process of creating a smooth, reflective surface on a faceted stone, particularly on the concave facets of certain cuts, such as the brilliant cut. The objective of roundshining is to enhance the brilliance and fire of a gemstone by minimizing light scattering and maximizing internal reflection.

The technique involves using fine abrasives and polishing laps that are shaped to match the curvature of the gemstone's facets. This precise shaping ensures that the polishing action is uniform across the entire surface, preventing the creation of unwanted facets or flat spots. Roundshining is particularly important for achieving optimal optical performance in diamonds and other highly refractive gemstones.

The effectiveness of roundshining can be assessed by examining the gemstone under magnification. A well-round-shined facet will appear smooth and free of any visible polish lines or imperfections. The clarity of the reflections and the intensity of the gemstone's sparkle are direct indicators of successful roundshining. This meticulous polishing process contributes significantly to the overall beauty and perceived value of a cut gemstone.