The Heart of Isis is a large diamond donated to the Save the Rainforest Charity Ball by Bruce Wayne.
History[]
Baiting Mr. Freeze[]
Mr. Freeze needed one more giant diamond to complete the Freezing Engine in his laboratory. Realizing his diamond dependency the dynamic duo used the Heart of Isis as bait. The presence of Poison Ivy's pheromone dust almost ruined this plan. Ivy made her public debut at the Charity Ball and wore the Heart of Isis after wooing the crowd. Mr. Freeze's tank arrived soon after with his Hockey Thugs and he took the necklace from her. After a high speed chase chase with the Batmobile the Heart of Isis was recovered and Victor Fries was sent to Arkham Asylum.