Srimad Bhagavatam Canto 11, Chapter 05, Text 27

SB 11.5.27

dvapare bhagavañ syamah
 pita-vasa nijayudhah
srivatsadibhir ankais ca
 laksanair upalaksitah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
In Dvapara-yuga the Supreme Personality of Godhead appears with a dark blue complexion, wearing yellow garments. The Lord’s transcendental body is marked in this incarnation with Srivatsa and other distinctive ornaments, and He manifests His personal weapons.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The Lord’s transcendental body in Dvapara-yuga can be compared to the color of a dark blue flower. The Lord exhibits His personal transcendental weapons such as Sudarsana cakra, and all of the limbs of His body, especially His hands and feet, are decorated with auspicious symbols such as a lotus flower and a flag. And on His chest, the Lord manifests the Kaustubha jewel as well as the auspicious Srivatsa, a whorl of hair curling from left to right on the right side of the Lord’s chest. Actually, such auspicious marks as Kaustubha and Srivatsa, as well as the weapons of the Lord, are present in all of the visnu-tattva incarnations. Srila Jiva Gosvami explains that these universal characteristics of the Lord mentioned by the sage Karabhajana are indications of the Krsna avatara. Because Krsna is the source of all incarnations, all of the symptoms of all other incarnations are to be found in His transcendental body.
Srimad Bhagavatam Canto 11, Chapter 05, Text 26
Srimad Bhagavatam Canto 11, Chapter 05, Text 28