Infernal gem
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Infernal Gem is a kind of environmental object in Baldur's Gate 3. It serves as a door lock for Raphael's Vault.
Involvement edit
Infernal Gem can be found inside the 
House of Hope, located directly south of the entrance to the Boudoir. It bars entrance to Raphael's Vault.
Passing a 
DC 10 Perception check is needed to spot the gem. It is named "Inert Infernal Gem" and can be interacted with, causing the character to roll a DC 10 Wisdom check. If successful the gem starts glowing and is renamed "Infernal Control Gem". Interacting with it once again causes a roll for a DC 20 Arcana check. If successful the gem dissappears and the door behind it opens, allowing access into Raphael's Vault.