A burn mark on a diamond facet typically refers to a discoloration or imperfection caused by excessive heat or pressure during the diamond cutting or polishing process. These marks can appear as small, dark spots or patches on the surface of the diamond and may affect the diamond’s overall appearance.
Burn marks are often the result of improper handling or overheating during the diamond’s treatment. When diamonds are cut or polished, they are exposed to various tools and equipment that can generate significant heat. If a diamond is exposed to heat for too long or if the temperature becomes too high, it can cause a chemical change or physical damage to the surface of the stone, resulting in a burn mark.
These marks are typically visible under magnification, and while they don’t usually affect the diamond’s structural integrity, they can reduce the stone’s visual appeal and lower its value. In some cases, burn marks may be polished out if the affected area is small, but more significant damage might require a re-cutting or recutting of the diamond.