Gemstone Ring

Gemstone Rings are items that can be equipped and will increase one of your stats by 1 depending on which Gemstone Ring you have.

There are 6 types of Gemstone Rings:

• 
  Diamond Ring
  Vitality +1
• 
  Ruby Ring
  Strenght +1
• 
  Emerald Ring
  Luck +1
• 
  Sapphire Ring
  Intelligence +1
• 
  Topaz Ring
  Agility +1
• 
  Amethyst Ring
  Dexterity +1

Sources

Gemstone Rings can be crafted by Heathin. He needs a Simple Ring, the Gemstone you wish and 1,000,000 GP.

For further information please check the wiki page Heathin's Simple Rings.