Assertion: peridot's color | /r/HasProperty | dark
Facets:
Source sentences:
text: The color is graded on its hue, tone, and saturation - hue for whether it is a warm or cool shade, tone for how light or dark the color is, and color saturation for the quality of being dull or a vivid blue.
text: In some rare cases, nitric acid can be used to lighten colors that are too dark.