Assertion: mineral's characteristic | /r/ObjectUse | used as basic descriptors of diamonds
Facets:
value: commonly
type: TEMPORAL
Source sentences:
text: Four characteristics, known informally as the four Cs, are now commonly used as the basic descriptors of diamonds: these are its mass in carats (a carat being equal to 0.2 grams), cut (quality of the cut is graded according to proportions, symmetry and polish), color (how close to white or colorless; for fancy diamonds how intense is its hue), and clarity (how free is it from inclusions).