In the beginning, it simply floats around his staff, but later can fly anywhere, and Zirconia uses it to gather images of those with beautiful dreams. He also uses it as a weapon, or to spy on his underlings. When Zircon is hit hard, any images it has gathered but not yet presented become distorted. It can also be used as a weapon with which to remove a human's Dream Mirror, similar to the Amazon Stones of the Amazoness Quartet.
He was killed along with Zirconia when Queen Nehelenia escaped from her mirror, destroying Zirconia for his failures.
In the manga, Zircon assisted Zirconia during the fight against the Sailor Senshi. After Zirconia called for a retreat of the Dead Moon Circus and they fled to Elysion, Zircon flew and became a headpiece of Nehelenia. It was sealed away with Nehelenia in the end of the Dream Arc.