artifact_can_be_gift_to_trigger

artifact_can_be_gift_to_trigger = {
	artifact_can_be_gift_base_trigger = yes
	trigger_if = {
		limit = {
			NOT = { $RECIPIENT$ = { has_artifact_claim = prev } }
		}
		trigger_if = {
			limit = {
				has_variable = banner_dynasty
			}
			$RECIPIENT$.dynasty ?= var:banner_dynasty
			artifact_owner = {
				# it make no sense giving your own banner to other member if you are dynast
				NAND = {
					var:banner_dynasty.dynast ?= this
					has_royal_court = yes
				}
			}
		}
		trigger_if = {
			limit = {
				has_variable = banner_house
			}
			$RECIPIENT$.house ?= var:banner_house
			artifact_owner = {
				# it make no sense giving your own banner to other member if you are dynast
				NAND = {
					var:banner_house.house_head ?= this
					has_royal_court = yes
				}
			}
		}
		trigger_if = {
			limit = {
				is_holy_relic_for = artifact_owner.faith
			}
			# Only gift holy relics to people of own faith
			$RECIPIENT$.faith = artifact_owner.faith
		}
		trigger_if = {
			limit = {
				has_variable = relic_religion
			}
			# make no sense gifting relic to heathen, but sending heathen stuff to others are acceptable
			OR = {
				artifact_owner.religion != var:relic_religion
				$RECIPIENT$.religion = var:relic_religion
			}
		}
		trigger_if = {
			limit = {
				var:artifact_succession_title ?= { is_title_created = yes }
			}
			# either its title destroyed, or recipient is rightfully owner, or you are not the title's holder
			OR = {
				var:artifact_succession_title.holder = $RECIPIENT$
				var:artifact_succession_title.holder != artifact_owner
			}
		}
	}
}

As written in game/common/scripted_triggers/00_artifact_triggers.txt.