Jainism describes a "Chakravarti" as a universal monarch, one of the 63 shalaka purushas (illustrious persons) in Jain tradition. A Chakravarti is not a liberated soul (not an Arihant or Siddha), but an ideal worldly ruler who possesses great power, wealth, and virtues, and rules over the six continents (Khandas) of Bharat Kshetra.

Regarding your specific question about a Chakravarti who made a "Sone ka Rath" (golden chariot) with "Hira Moti ki Murti" (idols studded with diamonds and pearls) and rode in it:

Jain scriptures, especially in the stories of Chakravartis like Bharat Chakravarti (son of the first Tirthankara, Rishabhanatha), describe immense wealth and grandeur. Chakravartis' processions and possessions, such as golden chariots adorned with precious stones, symbolize the peak of worldly prosperity and power.

However, Jain philosophy uses these stories to teach two main lessons:

1. Impermanence of Material Wealth: Despite possessing all material luxuries—including golden chariots and jeweled idols—Chakravartis ultimately realize the futility of worldly attachments. Such displays are meant to illustrate that even the greatest rulers cannot attain liberation (moksha) through material means. True happiness and liberation come only from renunciation and spiritual practice.

1. Transition to Renunciation: Many Chakravartis, after experiencing the limits and eventual dissatisfaction of worldly pleasures, renounce their throne and riches to become monks (shramanas), following the path of the Tirthankaras toward moksha.

Therefore, Jainism honors Chakravartis for their virtuous rule and achievements but emphasizes that the ultimate goal is spiritual realization, not worldly splendor. The stories of golden chariots and jeweled idols serve as reminders of both the heights of worldly success and the necessity of ultimately renouncing them for liberation.

If you seek details about a specific Chakravarti who performed such an act, Bharat Chakravarti is often associated with grandeur and such legends, but the essence in Jainism always returns to the message of impermanence and spiritual pursuit over material display.