Vampires who wear daylight amulets are usually referred to as 'daywalkers' by their fellow vampires and others.

Vampires can be given a second or replacement daylight ring, as long as it's enchanted for them as it is shown that Katherine Pierce had two; an amulet during the 1800's and a bracelet during the present day. Unfortunately, Lucy had cast a spell over Katherine and Elena so that whatever happened to Katherine would also happen to Elena. After learning of Bonnie's involvement, however, Lucy turns the tables on Katherine; after her debt to Katherine has been paid by getting her the moonstone, Lucy incapacitates her. Katherine awakes imprisoned in the tomb, where Damon says she should have been for a long time. As Damon closes the door of the tomb, Katherine screams that Elena is in danger and needs to be protected.

Like most vampires in the series, Katherine's attitude towards the lives of others has been significantly influenced by the end of her human life and how her vampirism affected her family. She suffered the heartache of being separated from her illegitimate daughter and disowned by her family, and not long after suffered the despair of finding her entire family dead, brutally murdered by Klaus. Any trace of the human girl who still believed in love seemed to evaporate after this last great loss, though it peeks through occasionally when it comes to Stefan. Do you think that, after all horrible things I've done...it would be possible to be forgiven?" —Katherine to Nadia Petrova is feminine and one of the most common surnames in both Russia and Bulgaria. The surname is derived from the first name Pyotr (Пётр, Russian) or Petar (Петър, Bulgarian), both equivalent to the English name Peter. Petrov means "son of Peter" in Russian and Bulgarian. [4] Katherine: (To Stefan) " It's stuffy. I've been in this dress for days. Wanna help me get out of it? Come on, Stefan. Don't be such a grump. We're here together. We might as well make the best out of it. You really think Damon's gonna rush to get you out? He's got what he wants. Elena." - By the Light of the Moon It appears that a Passenger (when inside a vampire) can still use their hosts daylight ring, as it is proven when Katherine was a passenger in Elena's body.

Katherine helps with Qetsiyah's spell but exchange for help with the issue of aging, Qetiyah accepts make a spell to stop it but after she resurrects Bonnie, Katherine agrees. Katherine, Amara and Elena are ready to perform the spell. They have to give some of their doppelgänger blood to do the spell. Qetsiyah cuts their hands and put their blood on Bonnie's grimoire, when they are about to complete the spell, they are interrupted by Silas. Katherine is a feminine first name of uncertain origin. It appears to come from the Greek Αικατερινηmeaning " each of the two", or possibly from καθαρος(Katharos) meaning " pure". The name is common in English. Katerina is of Bulgarian or Russian origin and means "pure". [3] Despite her ruthlessness, it is clear that Katherine has deep, genuine feelings for Stefan. Unable to reveal herself to him without ruining the usefulness of being dead, she still observed him from afar over the years, admitting as much to Stefan in the present day. In fact, Katherine is usually at her most honest about her true feelings when she believes she is unobserved, as when she kissed an unconscious Stefan before leaving Mystic Falls, and when she looked on at him in the 1920s speakeasy. Later on, Nadia and Katherine are eating lunch at a diner and Nadia tells her that she's been tailing her for 500 years and that she wants answers, and if she gets them, she'll let Katherine go. Katherine agrees and Nadia tells her that in 1864, she heard about the vampire round up in Mystic Falls, when Katherine sold out her other friends. Katherine tells her about the many horrible things she's done and Nadia asks her if she remembers ripping a mother away from her daughter. Katherine doesn't recall this and Nadia tells her that Katherine killed her mother in Paris in 1645, and that she has been spending the last 500 years hunting Katherine down for revenge. Katherine realizes that Nadia does not plan on letting her go. Nadia tells her it's time to leave and Katherine seizes the opportunity to grab a nearby cane and stab Nadia with it in the chest before running off.Later, Katherine is looking at herself in the mirror when Stefan appears. She brings up their night of passion but Stefan says they got swept up in the moment and he can't just forget the last 147 years. Katherine asks what she has to do to get redemption and Stefan says one night isn't enough to erase her history. Katherine responds that either one night or an eternity and he still won't look at her like he looks at Elena. As Katherine begins to leave, Stefan stops her and clutches her hand. He says that he's sorry that she's dying and she replies that she is too. Silas asks him to return Katherine for his brother, Damon makes up his mind and immediately calls Jeremy and tells him to return to the house. As soon as Jeremy turns around, Katherine knows what is happening and demands Jeremy to stop the car, however when he tells her to shut up, she tries to escape causing an accident where she and Jeremy are seriously injured by crashing into a post. She limps from the car, spotting a barely conscious Jeremy who asks for her help, she ignores him and hobbles away, leaving him dying in the middle of the road. Nadia suggests that Katherine try spirit possession. Since Katherine's father was a witch from the coven of the Traveler then technically Katherine is a Traveler witch too, meaning that she could use the spell to live in someone else's body. After Katherine says that Stefan prefers her in her current body, Nadia realizes that Katherine's question about forgiveness was in regards to Stefan and not her. Nadia angrily tells her mother to kill herself and see if anybody misses her. Katherine: (To Klaus/Alaric) " I don't know. You kidnapped me, remember? I'm kinda out of the loop." - The Last Dance Overall, Katherine has no respect for anyone's life but her own, and will not spare a life unless it suits her interests to do so. Although she has risked her life in the past to save Damon and Stefan, doing so was in the context of repaying a debt and killing Klaus, it remains untested whether her affection for the brothers could ever truly transcend her sense of self-preservation.

Katherine: (To Bonnie) " That still doesn't explain why you made me trudge through mud in 500 dollar boots." Katherine: (To Bonnie) " You realize I'm not just some wandering child in a supermarket, right? I'm a vampire that can kill you." - The Walking DeadStefan, I love you. I've always loved you. I guess this is how our love story ends." —Katherine to Stefan in Gone Girl Main article: Stefan and Katherine I forgive you. You weren't born evil. Life made you that way." —Elena and Katherine in 500 Years of Solitude Main article: Elena and Katherine Katherine then suspects that she may be dying and goes to Dr. Maxfield for help. She tells him the truth that Elena is her doppelgänger and tells him that he has to help her to not die.

Elena Gilbert: Ring, created by Gudren and given to Stefan Salvatore, was Katherine's before she faked her death in which she started to wear a bracelet or amulet. In The Tale of Two Wolves, Katherine's tintype photo is seen at the boarding school. This is a continuity error as the photo was destroyed in The Sacrifice on The Vampire Diaries.The rings grants vampires the ability of Day Walking that would otherwise only be naturally available to hybrids. The stone bears some similarity to the Gem of Amara from the Buffy and Angel franchise. With the only difference being that the Gem protects Vampires from demise, while the lapis lazuli only keeps them from burning up in the Sun. In The Cell, Stefan was keeping a close eye on Katherine after the suicide attempt. She was writing in a diary at his request because he's worried she will try to kill herself again. But Katherine was just as concerned about him since she overheard some of his PTSD. Stefan didn't want to talk about it, but Katherine had already invited Caroline over to help. In She's Come Undone, Katherine meets with Bonnie, who wants Silas' headstone which Katherine stole along with the cure. Katherine, reluctant to give up her potential leverage, asks Bonnie how she could benefit from handing it over, but Bonnie just vaguely insists that she would make it worth Katherine's while. When Katherine learned of the escape of the Tomb vampires, she gave her descendant and friend, Isobel, a Lapis Lazuli medallion, enabling the young vampire to walk in the sun. Katherine needed the tomb vampires dead because she didn't want Klaus to find out she was still alive, so she had Isobel retrieve Johnathan Gilbert's invention and give it to John Gilbert to use against the vampires in Mystic Falls. This resulted in the deaths of the remaining tomb vampires.