Rev 2:17

17 He who has an ear, let him hear what the Spirit says to the assemblies. To him who overcomes, to him will I give of the hidden manna, and I will give him a white stone, and on the stone a new name written, which no one knows but he who receives it. 

A white stone and a new name which no one knows but he who receives it – in Rev 2:28, the Spirit of Christ tells the saints He will give them the morning star. The Spirit of Christ is the morning star, and the “stone” having seven eyes, described in Zech 3:9. In Zechariah, we read that there is an “inscription on it,” and this stone “will remove the iniquity of the land in one day.” Through the cross, Christ gave the saints a new name, through the forgiveness of their sin. The white colour symbolises the righteousness of Christ that is received by the saints.