Learn · Diamonds
How to read a lab report
A laboratory report describes a stone: what it is, its measurements and grades, and what the lab could detect. Tap any part of the example report to see what it means and the scale it sits on. The example is a generic layout, not any laboratory's own design; every lab arranges its reports differently.
Choose a diamond or coloured stone report, then tap any part of it.
Read the guide
Six-prong solitaire, taken apart
A solitaire ring in 3D: its parts, and how proportions change the cut grade
Diamond colour, D to Z
One diamond moved along the D-to-Z colour scale, face-up and in the grading tray
Diamond clarity map
Every clarity characteristic GIA defines, inside a diamond you can turn
Diamond fluorescence
None to Very Strong under the lamp, and what research found about daylight
Fancy shapes and the bow-tie
Stretch a fancy shape and see where light leaks and the bow-tie appears
Lab-grown, step by step
How CVD and HPHT diamonds are grown, step by step, and how labs tell