Episode 1 - The Masquerade Part I
The Vampire Gem is seen on Dorian's necklace throughout the episode.
Episode 2 - The Masquerade Part II
The guests slay Dorian and receive their first gem. However, the Vampire Queen requires one of the guests to die to make up for his death. Lauren and Destorm are voted in, and Lauren is eaten by Vampires after failing to complete the final challenge.
Episode 10 - The Sorceress
The Vampire Gem was seen on the Crown Of Oblivion throughout this episode.