The Skill Ring is a thick, silver ring with a small diamond on its side and a strip of metal or crystal lining the middle of its outer edge. Both the diamond and the line are light blue, but the line also shimmers in shades of blue and purple.
In Kingdom Hearts III, the Skill Ring is a featureless, gold ring with a deep indented line in the middle of the band. The Skill Ring+ adds a raised strip of silver with pointed ends that runs around most of the band.
Kingdom Hearts III