A Rainbow Ring is a Ring-class item coded in Golden Sun: The Lost Age; However, it is not acquirable by any means within the game. It can only be accessed through a hacking device such as an Action Replay. Visually, the Rainbow Ring resembles a ring with a very colorful jewel on top, glowing blue at the left, green at the center, and red at the right. In addition, two star sparkles are shown above the ring icon.

The Rainbow Ring, as with other rings, is used for its effect strictly. It is also Used as an item by an Adept able to equip it in battle (but it does not actually have to be equipped, needing only be in that Adept's inventory) to emulate the Delude Psynergy to attempt to inflict up to three enemies with Delusion. It is bought for 900 coins while its resale value is 675 coins. It’s repair cost is 225 coins.

The Rainbow Ring, wearable by all Adepts, would have proven to be a potentially useful ring to use, being able to severely lower the accuracy of multiple enemy targets. It is unknown why it was not included in the actual game if it was designed and coded. Incidentally, this is not the only ring that has been coded into The Lost Age without actually being featured; the other two such rings are the Aroma Ring and the Soul Ring. It is possible that they were meant to be prizes in the slot machines in The Lost Age, since there are exactly three such unimplemented rings, but it was later decided to use the same prizes as in Tolbi.

Rings in Golden Sun
Healing RingUnicorn RingSleep RingWar RingFairy RingAdept RingCleric's Ring
Rings in Golden Sun: The Lost Age
Healing RingUnicorn RingSleep RingGuardian RingStardust RingWar RingAdept RingSpirit RingGolden RingRainbow RingSoul RingAroma Ring
Rings in Golden Sun: Dark Dawn
Zol RingLady Moon's RingLord Sun's RingHeirloom RingCleric's Ring