Someone datamined some interesting info in the Yu-Gi-Oh Master Duel game. An asset previously aptly named “Icon Frame 8” has been updated with new art and renamed to “Diamond Frame”. Also the description for this asset got updated to read as follows:
An Icon Frame given to duelists when they first reach DIAMOND in Ranked Duels. Only the most masterful of duelists who have reached extraordinary heights are presented with this honor. Keep polishing your skills and you will shine brighter than anyone else.