The full name of the clarity char is "Clarity Characteristics", which represents the clarity features of diamonds and is a description of clarity levels. This item usually appears on diamond GIA certificates, and the corresponding words are usually Feather (feather crack), Cloud (cloud like object), etc., which describe the internal flaws of diamonds.
The relevant description of Clarity Characteristics on the GIA certificate
Feather: feather
Pinpoint: Needle point package body
Included Crystal: Included crystal
Dark Included Crystal: Dark Included Crystal
Cloud: Cloud like object
Needle： Needle tip package
Internal Graining : Internal crystallization pattern
Surface Graining : Surface crystallization pattern
Twinning Wisp: Double crystal pattern
Laser Drill Hole: Laser hole
Chip: Gap
Indented : Indented Natural
Abrasion: Wear marks
Scratch: Scratches and scars
Nick: scar
Extra Facet: Extra Facet