A faeries Dream/Nightmare Come True (Harry potter story quiz)

You open the box to find two daggers and what looked to a smaller box, and when you opened the smaller box you find a nexklace that seem to turn from blue to white in front of your eyes, you shoot them a questioning look and your mother smiles and goes to you and takes the necklace from you and puts it on while saying "This necklace is special it can dectect when a lie is being said and when someone is telling the truth" she points to the gem and adds " the orginal color war blue which is netural, but when you held it up it turned white which lets you know the person is telling the truth and black to show that person is lying" she finishes and goes back to sit next to Adrian.