Diamond Light Performance Certification
Understanding Your Diamond’s Light Return
A diamond’s defining quality is how it interacts with light—creating its brightness, contrast, and movement.
This is expressed through brilliance (white light), fire (color), and scintillation (movement), which together shape its overall presence.
Light performance is driven by cut and proportion—how effectively light enters, reflects, and returns through the stone.
Direct Assessment
Light performance is best understood through how a diamond interacts with light in real conditions. Independent analysis from certifications such as GCAL helps measure brightness, fire, and overall light return beyond traditional grading reports alone.
These evaluations use detailed imaging and assessment tools to show how each individual diamond reflects and returns light, offering deeper insight into a diamond’s real-world visual performance.
Optical Brilliance Analysis
Brilliance refers to the return of white light, creating a diamond’s overall brightness.
Independent analysis, such as GCAL, captures how light reflects across the stone—revealing its balance of brightness and contrast.
These insights provide a consistent view of how a diamond performs.
Fire Analysis
Fire refers to the flashes of color a diamond emits as light disperses through the stone.
This movement creates vibrancy, shaped by the diamond’s cut and how it interacts with light.
Advanced optical analysis (such as from GCAL), captures how each diamond expresses color in motion.
Scintillation Analysis
Scintillation refers to the dynamic flashes of light seen as a diamond moves.
This interplay of brightness and shadow creates its signature sparkle, shaped by how the stone is cut.
Advanced imaging, like GCAL analysis, captures how each diamond expresses light in motion.