Ring of the Mage

An enchanted sapphire, set into a ring. It aids the spellcasting of its wearer.

A sapphire ring
Wizardry ego
+3 INT
+50 MR

An excellent item for most casters, although those with enough MR may eventually prefer a ring of intelligence with a higher enchantment. Also valuable to any character who needs MR, as it provides more than a mundane ring of magic resistance.