create_artifact_icon_effect

create_artifact_icon_effect = {
	$OWNER$ = { save_scope_as = owner }
	$CREATOR$ = { save_scope_as = creator }

	hidden_effect_new_object = {
		# Get artifact quality, wealth, materials, and decorations
		get_artifact_quality_effect = yes
		get_artifact_wealth_effect = yes

		random_list = {
			50 = {
				trigger = { scope:owner = { has_royal_court = yes } }
				create_artifact = {
					name = artifact_icon_name
					creator = scope:creator
					description = placeholder # Will be updated in the post-creation effects
					visuals = icon_court_large
					type = wall_icon_court_large
					modifier = artifact_placeholder_modifier
					wealth = scope:wealth
					quality = scope:quality
					save_scope_as = newly_created_artifact
				}
			}
			50 = {
				trigger = { scope:owner = { has_royal_court = yes } }
				create_artifact = {
					name = artifact_icon_name
					creator = scope:creator
					description = placeholder # Will be updated in the post-creation effects
					visuals = icon_court_small
					type = wall_icon_court_small
					modifier = artifact_placeholder_modifier
					wealth = scope:wealth
					quality = scope:quality
					save_scope_as = newly_created_artifact
				}
			}
			50 = {
				trigger = { scope:owner = { has_royal_court = no } }
				create_artifact = {
					name = artifact_icon_name
					creator = scope:creator
					description = placeholder # Will be updated in the post-creation effects
					visuals = trinket_icon
					type = miscellaneous_when_not_court
					modifier = artifact_placeholder_modifier
					wealth = scope:wealth
					quality = scope:quality
					save_scope_as = newly_created_artifact
				}
			}
		}

		scope:newly_created_artifact = {
			# Get decoration type and update description
			get_artifact_feature_references_effect = yes
			set_artifact_name = artifact_icon_name
			set_artifact_description = artifact_icon_description

			# Crowns with high rarity get more modifiers
			if = {
				limit = {
					rarity = illustrious
				}
				add_2_scaled_artifact_modifier_rulership_effect = yes
				add_scaled_artifact_modifier_devotion_effect = yes
				add_scaled_artifact_modifier_piety_effect = yes
			}
			else_if = {
				limit = {
					rarity = famed
				}
				add_2_scaled_artifact_modifier_rulership_effect = yes
				add_scaled_artifact_modifier_devotion_effect = yes
				add_scaled_artifact_modifier_piety_effect = yes
			}
			else_if = {
				limit= {
					rarity = masterwork
				}
				add_scaled_artifact_modifier_piety_effect = yes
				add_scaled_artifact_modifier_rulership_effect = yes
			}
			else_if = {
				limit= {
					rarity = common
				}
				add_scaled_artifact_modifier_piety_effect = yes
				add_scaled_artifact_modifier_rulership_effect = yes
			}

			set_variable = {
				name = quality
				value = scope:quality
			}
			set_variable = {
				name = wealth
				value = scope:wealth
			}
		}
	}
}

As written in game/common/scripted_effects/00_ep1_artifact_creation_effects.txt.