Wild Luck Alexandrite

The Wild Luck Alexandrite (also known as "Odd-Luck Alexandrite") is a Ring found in Greed Island.

Background
This item can be received if you donate money and anything else they need to the Sick Villagers and at a later date return to them with the Paladin's Necklace in your possession to purify them of their illnesses.

Greed Island arc
When Gon and group return to the Sick Villagers in their village, Gon uses his Paladin's Necklace to cure the Sick Villagers of their illness and he's awarded with the Wild Luck Alexandrite that immediately turns into it's card form.