What does Exceptional Gold Nugget do in CK3?

Prestige +0.08/month (patch 1.20.0.3).

How do you get Exceptional Gold Nugget with the console?

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

Court artifact · Pedestal Item

Exceptional Gold Nugget

Rarity rolled when it is madeThe Royal Court

Exceptional Gold Nugget is a pedestal item artifact in Crusader Kings III: Prestige +0.08/month. It needs The Royal Court. Patch 1.20.0.3, from game/common/scripted_effects/01_ep1_court_artifact_creation_effects.txt.

Quick answers (2)

What does Exceptional Gold Nugget do in CK3?: Prestige +0.08/month (patch 1.20.0.3).
How do you get Exceptional Gold Nugget with the console?: effect create_artifact_pedestal_gold_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).

A huge gold nugget — its unparalleled size must be a sign of divine favor.

Effects

Prestige+0.08/month

Also gets random bonuses when it is made, from add_scaled_artifact_modifier_grandeur_small_effect — the bigger ones at higher rarity.

How it is made

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

effect create_artifact_pedestal_gold_effect = { OWNER = root }

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

Source: game/common/scripted_effects/01_ep1_court_artifact_creation_effects.txt, common/modifiers (artifact_monthly_prestige_2_modifier) and the English localisation, Crusader Kings III 1.20.0.3.