In Jain tradition, King Shrenik (also known as Bimbisara) was a prominent ruler of Magadha and a devoted lay follower (shravak) of Lord Mahavira, the 24th Tirthankara. The "bull jewel" (Vrishabha Mani or Vrishabha Ratna) is one of the "Fourteen Jewels" (Ratnas) that are associated with a Chakravarti (universal monarch) in Jain cosmology. However, King Shrenik himself is not directly associated with possessing the "bull jewel" in Jain scriptures.

The "bull jewel" is described as a miraculous animal that can fulfill many tasks and is one of the signs of a Chakravarti, not specifically of King Shrenik. While King Shrenik greatly supported Jainism and had significant interactions with Lord Mahavira, the stories of the "bull jewel" are not typically linked to his life in Jain texts.

If you are seeking stories of King Shrenik's devotion or his role in Jain history, he is celebrated for his piety, support of the Jain sangha, and his efforts to protect monks and nuns. If you have a specific story or reference you would like clarified, please provide more details!