Ring of The Snake (3.5e Equipment)
From D&D Wiki
Ring of The Snake: This ring is crafted in the shape of a coiling king cobra. Its wearer gains a +2 bonus on all his grapple checks and deals 1d3+4 damage on all successful grapple checks. Once per day, the wearer can poison a target with one successful unarmed strike. The target receives 5d10 points of damage and another 1d10 points of temporary damage one minute later. Each instance of damage can be negated by a DC 14 Fortitude save. The ability must be declared before the attack and is used for that minute if the attack misses.
Moderate transmutation, necromancy;CL 7; Forge Ring, polymorph, poison; Market Price: 26,950gp