CC Madhya 9.156

maṇir yathā vibhāgena
nīla-pītādibhir yutaḥ
rūpa-bhedam avāpnoti
dhyāna-bhedāt tathācyutaḥ
Synonyms: 
maṇiḥ — jewel, specifically the jewel known as vaidūrya; yathā — as; vibhāgena — separately; nīla — blue; pīta — yellow; ādibhiḥ — and with other colors; yutaḥ — joined; rūpa-bhedam — difference of form; avāpnoti — gets; dhyāna-bhedāt — by different types of meditation; tathā — similarly; acyutaḥ — the infallible Supreme Personality of Godhead.
Translation: 
“ ‘When the jewel known as vaidūrya touches various other materials, it appears to be separated into different colors, and consequently its forms also appear different. Similarly, according to the meditational ecstasy of the devotee, the Lord, who is known as Acyuta [“the infallible one”], appears in different forms, although He is essentially one.’ ”
Purport: 

This is a verse quoted from Śrī Nārada-pañcarātra.