Ring of evasion
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A +5 ring of evasion boosts the evasion of its wearer by 5.
Desirability
All characters can benefit from more EV, but using a ring slot for it may or may not be a good idea depending on your other resistances. Unlike amulets, though, you can quickly swap between rings.
Rings of evasion are more effective, on average, than a ring of protection. However, AC is more reliable than EV; with evasion, you either dodge or you don't. If you already have high AC, then a ring of evasion can be a good defensive choice (AC has a somewhat diminishing return, since it can't reduce attacks below 0)
A ring of dexterity can end up providing more EV for characters with high Dodging skill (among dexterity's other benefits).