By understanding these three elements of color you know what to expect when a fancy color diamond is being quoted or described. When a GIA report accompanies a stone, these details will give you somewhat of an accurate description before your first peek at the stone.
Diamond Tone Definition | Diamond Tone is Darkness of Shade
Tone refers to the darkness or shade of color. The darker a diamond, the stronger the tone. Tone and saturation are two completely different elements. A vivid fancy yellow has high saturation and a dark tone. Add a little gray or brown to the yellow and it diminishes the saturation of yellow but maintains or strengthens the tone.