Verse 7

प्रह्रादनामा बलवान्प्रधानात्मा बभूव ह ।तेषां मध्ये महार्हाणां मणीनामिव कौस्तुभः

In plain words

Among them there was one named Prahrāda, powerful, foremost in nature, like the Kaustubha among precious gems.