The Diamond Power of Veto was introduced as the final veto of
Big Brother 4. It was essentially the same as a Golden Power of Veto because it was used for the Final 4, in which case there was only one possible replacement nominee anyway. It was used by Alison Irwin to save herself from the threat of eviction. Erika Landin was the only possible replacement because Jun Song was already up on Nomination Block and Robert Roman was the Head of Household. The Diamond POV was reintroduced in
Big Brother 12 and awarded to Matt Hoffman as a gift from Pandora's Box. The rules of the Diamond Power of Veto became more clear then when it was first introduced in season 4. It grants the bearer the power to remove a player off of nomination block and then select the nomination themself, rather then deferring to the HOH for the replacement nominee. The holder of this veto may not select either the HOH or the regular Veto holder as a replacement.