Blue Ring (Oracle Series)
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The Blue Ring is a Magical Ring that Link can obtain in Oracle of Ages. While progressing through the Ancient Tomb, Link will acquire the dungeon item, the Power Glove. This item will allow Link to lift large objects, including the blue Sarcophagus Statues that are found just outside of the Ancient Tomb within the Sea of No Return.
At the east end of the Sea of No Return, there is a Sarcophagus Statue that us surrounded by several Blue Darknuts and Blue Lynels. Lift up this statue to reveal a treasure chest. Open it up to get a Seed Ring, which turns out to be the Blue Ring.
There is no possible way to obtain the ring in Oracle of Seasons directly but it can be obtained by using the Ring Secret in a Linked Game.
When the Blue Ring is worn, it will double the damage Link is willing to withstand. Unlike the Armor Ring L-2, which also doubles Link's ability to withstand damage, the Blue Ring will have no effect on the damage that Link does when he attacks enemies.
A similar ring effecting Link's Strength can be acquired in the form of the Red Ring. There is another color-based ring that combines the effects of the Blue and Red Ring in the form of the Green Ring.