How do you get Cintamani Stone with the console?

effect create_artifact_cintamani_hindu_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).

What if the owner can't benefit from Cintamani Stone?

They get Court grandeur baseline +3 instead.

Court artifact · Pedestal Item

Cintamani Stone

FamedUniqueHoly relic

Cintamani Stone is a famed pedestal item artifact in Crusader Kings III: Court grandeur baseline +3, Domain Taxes (Same Faith) +4%, Piety +0.5/month. Quality 70 and wealth 70; maximum durability 100, and it does not wear out. Patch 1.20.0.3, from game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt.

Quick answers (3)

What does Cintamani Stone do in CK3?: Court grandeur baseline +3, Domain Taxes (Same Faith) +4%, Piety +0.5/month (patch 1.20.0.3).
How do you get Cintamani Stone with the console?: effect create_artifact_cintamani_hindu_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).
What if the owner can't benefit from Cintamani Stone?: They get Court grandeur baseline +3 instead.

This is a stone that is said to have once fallen from the sky. Some claim it once belonged to Vishnu or the Naga King, and that it also brings prosperity to its owner.

Effects

For an owner who can't benefit from it

The template gives these instead of the effects above when its “can benefit” check fails:

Court grandeur baseline+3

Who can benefit (can_benefit) (3 lines of game script)

hindu_or_syncretic_with_eastern_trigger = {
	CHARACTER = root
}

As written in game/common/artifacts/templates (branch_hinduism_template).

Counts as a holy relic for (is_holy_relic) (6 lines of game script)

OR = {
	religion = religion:hinduism_religion
	main_rite = {
		rite_has_parameter = eastern_syncretic_actor
	}
}

As written in game/common/artifacts/templates (branch_hinduism_template).

History and who has it

Made before recorded history.

How it is made

The game creates it with the scripted effect create_artifact_cintamani_hindu_effect. In the console (how to open it), this gives it to the character you play:

effect create_artifact_cintamani_hindu_effect = { OWNER = root }

Built from the effect's file; not run in the game by us.

Source: game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt, common/modifiers (cintamani_modifier), common/artifacts/templates (branch_hinduism_template) and the English localisation, Crusader Kings III 1.20.0.3.