The Ice Queen's Tiara is a golden tiara belonged to the oppressive witch known as the Ice Queen and an object in a fanfic written by the manic wizard known as the Ice King in the animated series Adventure Time. It looks quite indistinguishable to is similar to the Ice King's veyr own Crown.
This typical royal-looking gold tiara is similar to the Ice King's Crown, only smaller. The most notable difference is that it has 5 points rather than only 4.
Just like her male counterpart's Crown, her powers are contained in her Tiara. It could give anyone the power over the element of ice, as shown when Cake put it on and blasted the Ice Queen with a snow blast.
It may or may not cause insanity when worn, based on the Ice King's origin story, though Fionna told Cake not to wear it because she "might catch her crazy." This indicates that the Ice King knows that the tiara like his crown causes insanity.
Other people can use its magical freezing powers such as snow blasts while wearing it. But anyone who would it, good or otherwise, would corrupt their minds and cause them to go mad and do harm. It is why the tiara itself is considered dangerous.
- It is possible that the Ice Queen can resize her tiara like the Ice King (with his crown) If she can, then she can make her crown the same size as the Ice King.
- It is unknown whether the tiara causes insanity (in the same way that the Ice King's crown does). Fionna told Cake not to wear the tiara because she "might catch her crazy," although Cake was unaffected after Fionna knocked it off her head. However one quick use might not be long enough to affect the user.
- This indicates that the Ice King might know that the tiara/his crown causes insanity.