Beyond Z, colour stops being a fault and becomes the point. Pick a colour and move one diamond through GIA's fancy grades, see where each grade sits by lightness and strength, learn what gives a diamond its colour, and how a laboratory tells natural colour from treated or laboratory-grown.
Pick a colour, then move the slider through the fancy grades; tap a grade in the row below to load 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
How to read a lab report
Each part of a laboratory report explained, on an example report