Narayana has kaustubha mani dangling on his chest. He also holds sudarshana chakra,abja padma,koumodki gada and shankha.This shankha gives all kinds of prsoperity .It fortifies all gains of knowledge. When Dhruva opened his eyes after long penace . he was surprised to see the same person(the one he was meditating) before him . He being a child, felt short of words to praise lord. Understanding his feelings , God tousched his shankha to his cheeks . This made him a scholar to praise Keshava.shankha is sridevi ,Kaustubha is Bramha ,Chakra is Durga, Padma is Bhudevi, gada is Vayu dev, SSharanga is Saraswati . All Gods' ornaments are manifestation of Laxmi.She personally looks after Him even if she has many servants.Thus Laxmi is most dear to Krishna.