Bolt Blood Gems are a type of Blood Gem in Bloodborne.
- A blood gem that fortifies weapons and adds various properties. Blood gems are especially rare blood stones that grow on coldblood.
- Blood gems are kneaded into weapons using workshop tools, but only when of matching shape.
- Circular blood gems are normally used to fortify firearms.
- As with all other elemental Blood Gems, Bolt Blood Gems share the same icons as their Odd counterparts, the Odd Bolt Blood Gems.