CC Ādi 3.39

dvāpare bhagavān śyāmaḥ
pīta-vāsā nijāyudhaḥ
śrīvatsādibhir aṅkaiś ca
lakṣaṇair upalakṣitaḥ
Synonyms: 
dvāpare — in the Dvāpara-yuga; bhagavān — the Supreme Personality of Godhead; śyāmaḥ — blackish; pīta-vāsāḥ — having yellow clothes; nija — own; āyudhaḥ — having weapons; śrīvatsa-ādibhiḥ — such as Śrīvatsa; aṅkaiḥ — by bodily markings; ca — and; lakṣaṇaiḥ — by external characteristics such as the Kaustubha jewel; upalakṣitaḥ — characterized.
Translation: 
“In the Dvāpara-yuga the Personality of Godhead appears in a blackish hue. He is dressed in yellow, He holds His own weapons, and He is decorated with the Kaustubha jewel and marks of Śrīvatsa. This is how His symptoms are described.”
Purport: 

This is a verse from Śrīmad-Bhāgavatam (11.5.27), spoken by Saint Karabhājana, one of the nine royal mystics who explained to King Nimi the different features of the Lord in different ages.