ArtifactAppearanceID

The ArtifactAppearanceID is a numeric indicator of which appearance, or "skin," is used by the artifact.
It can be obtained using the API C ArtifactUI.GetAppearanceInfoByID, as well as API C ArtifactUI.GetPreviewAppearance.
== List of IDs ==
Class 	Spec 	Appearances	 	 	
 	Blood 	 	 	 	
 	Name 	Color 1 	Color 2	Color 3	Color 4
 	Maw of the Damned	107 	355 	356 	357
Bloodmaw 	358 	361 	362 	363 	
Soulreaper 	368 	367 	360 	369 	
Executioner 	576 	577 	578 	579 	
Bonejaw 	364 	359 	365 	366 	
Twisting Anima of Souls	921 	922 	923 	924 	
=== Miscellaneous ===
These items are not obtainable, however still exist within the game files for some reason. They are likely test files.
Name 	ID 	Placement (Color)
Purple Crystal	1 	1
Blue Crystal 	2 	2
Red Crystal 	3 	3
Orange Crystal	836	0
Yellow Spikes 	5 	1
Fiery Spikes 	7 	2
Green Spikes 	6 	3