Ring of Dexterous Strength (5e Equipment)
From D&D Wiki
Ring, very rare (requires attunement)
When you wear this ring, you may add both your Dexterity and Strength modifiers to the damage rolls of melee weapon attacks. In addition, any one-handed weapon that does not have the versatile property is considered to have the finesse property if you wield in the hand on which you wear this ring.