Swargaloka gems are called mani , kaustabh mani stone is one of the four swargloka gems . It is known by various names in following in sanskrit padmanaga , lohita , shonarathna , raviratna , kuruvinda , vasurathna , chunni ( in punjabi ) , yakootha ( urdu ) , lakshmi puspa ( sanskrit ) , sowgandhika , ratnanayaka .
1. Kaustabh mani stone is lotus red in color .
2. It is worn by lord krishna / lord vishnu .
3. In hindu mythology, the devas and asuras performed the “churning of the ocean of milk” ( samudra manthan ), in order to get amrita . In this process, the fourteen treasure jewels (atnas) emerged from the ocean. The fourth ratna that emerged is known as kaustubha.