Clarity plotting is to judged in terms of both inclusion and blemishes.
Clarity : Penetrating or enclosed within the Gem.
Blemish : Strictly to/on the surface of the Gem
Five(5) Factor system of explaining Gems pricing.
- Size of inclusion.
- Location (position)
- Quantity (Number) of inclusion
- Type (of inclusion) :
- Contrast (relief & color) :
Some descriptive words that are occasionally used:
|Included Crystal :||a solid crystal or a liquid like, often angular inclusion.|
|Chip :||Small damaged area (usually at the girdle)|
|Indented natural :||A dark included crystal or a hole opening inside a Gem.|
|Cloud :||Any hazy or milky area inside the gem.|
|Feather or fingerprint :||A partially healed fracture or fissure, or a group of small particles trapped during the natural growth process or synthesis.|
|Pinpoint :||Very small, light or dark included crystal (occurring as a dot or dots)|
|Needle:||Thin rod-like crystal inclusion or a fine parallel silk inclusion.|
|Nick :||a Small opening or damaged on a polished surface ( at the girdle of Gem).|
|Bruise :||Surface crumbling, often accompanied by tiny, root-like feathers.|
|Cavity :||A large or deep opening.|
|Horse-tail or pony-tail:||Fibrous inclusions radiating from a nucleus in demantoid garnet.|
|Snowflake:||Whitish crystallites on a dark background in obsidian.|