Is Lab Grown Diamond Fluorescent?
September 12,2024
The fluorescence of cultivated diamonds refers to the light emitted when excited by ultraviolet light. Fluorescence is closely related to color, and cultivated diamonds can reflect colorful light to form a dazzling array of colors when exposed to light. The lighter the color, the stronger the color of the flash.
Many cultivated diamonds do not exhibit fluorescence, but some lab-grown diamonds can fluoresce under certain wavelengths. According to relevant data, after grading over 26,000 diamonds for comparison, GIA found that only about 25-35% of cultivated diamonds emit diamond fluorescence when tested under standard long-wave ultraviolet light. Therefore, it is normal for cultivated diamonds not to fluoresce.
The fluorescence of cultivated diamonds cannot be detected without ultraviolet light exposure in an environment with sufficient fluorescence intensity. Testing structures like GIA certificates will examine fluorescence components to ensure consistency between the report and the actual diamond.
Diamond fluorescence is not part of the 4C quality standards for diamonds, which refer to color, clarity, cut, and carat weight. GIA testing institutions consider fluorescence as an identifying characteristic that provides additional information for distinguishing different diamonds. The GIA certificate describes fluorescence intensity as none, faint, medium, strong, or very strong. If the intensity meets the criteria of medium, strong, or very strong, the certificate will note the fluorescence color.
Fluorescence does not affect the sparkle of cultivated diamonds, as sparkle depends on the diamond’s cut. Diamond cut refers to the angles of facets, relevant dimensions, diamond proportions, design, and craftsmanship, all of which can affect the diamond’s brilliance.