Zol Ring

A Zol Ring is a ring-class item introduced in Golden Sun: Dark Dawn.

Basic Description by Game
The Zol Ring increases the wearer's Agility by a multiplicative factor of 1.8. It can be bought for 2500 coins and sold for 1875 coins.

In Dark Dawn, one Zol Ring is given to the player as a gift by Passaj's smiths, for restarting both the Alchemy Forge and their own personal forges. Later on in the game, multiple Zol Rings can be obtained by giving Quality Zol to Obaba of Champa. Once forged, she will give the Zol Ring to the player free of charge.

Analysis
The Zol Ring is an extremely useful Ring that possesses the highest agility boost of any item in the series as of Dark Dawn, almost doubling the agility of the character equipping it. Even the debilitating Safety Boots, which decrease agility by 30% (multiplies by 0.7) can't offset this boost, granting a total boost of 26%. It is worth giving to any slower Adept, like the Fire Adepts Tyrell and Eoleo or the Water Adepts Rief and Amiti. In any case, the Zol Ring is the only ring that can be obtained in multiples. Since only 3 other rings are available prior to the final boss, the Zol Ring is worth giving to any Adept that doesn't already possess a Ring.

In addition, this is the only ring in Dark Dawn which players can obtain multiples of, so in order to give rings to each character one would have to use multiple Zol Rings.