Overall
Srimad-Bhagavatam
SB Canto 3
Even if a gem just taken from a mine looks unpolished, the luster of the gem cannot be stopped. Similarly, although Kardama was not properly dressed and his body was not properly cleansed, his overall appearance was gemlike.
SB 3.21.45-47, Purport: We have actually seen that many brahmacārīs and gṛhasthas connected with the International Society for Krishna Consciousness have improved in health, and a luster has come to their faces. It is essential that a brahmacārī engaged in spiritual advancement look very healthy and lustrous. The comparison of the sage to an unpolished gem is very appropriate. Even if a gem just taken from a mine looks unpolished, the luster of the gem cannot be stopped. Similarly, although Kardama was not properly dressed and his body was not properly cleansed, his overall appearance was gemlike.