A Bloodstone is a common Gemstone, primarily of use for bartering, or sale to Traders.
Anyone can squeeze blood from a stone if the edges are sharp enough.
Properties
Miscellaneous Items
Rarity: Common
Weight: 0.01 kg / 0.02 lb
Price: 40 gp 
UID
LOOT_GEM_Bloodstone_A
Where to find
Found throughout the game as set-dressing and random loot.
External Links
Bloodstone on the Forgotten Realms Wiki