Diamond enhancements are specific treatments, performed on natural diamonds (usually those already cut and polished into
gems), which are designed to improve the visual
gemological characteristics of the diamond in one or more ways. These include
clarity treatments such as
laser drilling to remove black carbon inclusions, fracture filling to make small internal cracks less visible,
color irradiation and annealing treatments to make yellow and brown diamonds a vibrant fancy color such as vivid yellow, blue, or pink.