Sigil of Lucifer Signet Ring
The Sigil of Lucifer, or Seal of Satan if you're going by the grimoire, has been showing up in occult literature since the Grimoirium Verum and on alternative jewellery ever since the late 20th century decided organised religion wasn't doing it for everyone.
A signet ring is already a power move, historically you stamped documents with it, made things official, closed deals. Putting the Leviathan cross on one is just being honest about where your allegiances lie. This is gothic jewellery for people who treat occult symbolism with the seriousness it deserves, not a costume piece, not a phase.
Stainless steel construction, lead and nickel free. Available in sizes 7, O, and 14 (17.35mm internal diameter).