Gold Ring

Gold Rings are objects that appear in New Super Mario Bros. 2. They are similar in appearance to the Coin Rings from Super Mario 3D Land. If Mario or Luigi passes through one of these, all enemies will turn golden, twinkling effects are added to the game screen and the music slightly changes with "sparkly" sounds added to it. In this state, five coins are given for each defeated enemy. If multiple enemies are defeated consecutively (either by stomping on them without touching the ground or using a Koopa Troopa shell), the number of coins earned is 10, 15 and 20 for second, third and fourth enemies. After 4 enemies, 50 coins are given for each consecutive enemy. Additionally, while in their golden form, most enemies leave trails of coins behind as they move, or even throw coins instead of their usual projectiles. If Mario is in Gold Mario form, he will earn more coins than usual.

Trivia

 * In the E3 trailer of New Super Mario Bros. 2, when the enemies were in their golden forms, it was shown that only five coins were given for each enemy defeated in succession (using the golden Koopa shell) instead of having five, ten, fifteen and twenty for the first four enemies and fifty coins after that for every consecutive enemy.
 * Golden Goombas are the only golden enemies that only give coins when defeated.