when Shuraka put his hand to Tei's face, all of his rings match Tei in some capacity. The red rubies/gems being the exact same color as Tei's eyes, moreover the second ring literally just being black with a red gem. I'm sure given the vibe and presentation of Shuraka's culture thus far, it seems to value a lot of color and gold, so having a fully black band (w/red gem) is basically a testament of Shuraka's dedication to Tei.
when Shuraka put his hand to Tei's face, all of his rings match Tei in some capacity. The red rubies/gems being the exact same color as Tei's eyes, moreover the second ring literally just being black with a red gem. I'm sure given the vibe and presentation of Shuraka's culture thus far, it seems to value a lot of color and gold, so having a fully black band (w/red gem) is basically a testament of Shuraka's dedication to Tei.