Bloodstone

Bloodstone was a semi-precious stone found mostly in northeast Faerûn, especially the Galena Mountains between Damara and Vaasa. Ninety percent of the bloodstone mined in Faerûn came from this area, known as the Bloodstone Lands, and one particular mine produced the majority of the supply, circa the Year of Wild Magic, 1372 DR.

Description
Bloodstone was the Realms name for the mineral heliotrope, a deep green-gray chalcedony with inclusions of red jasper that looked like flecks of blood. When worn for adornment, it was usually cut cabochon, and either polished into smooth ovals or given beveled edges. A typical specimen had a base value of 50 gp.

Historically, bloodstone was also sold in bars worth 25 gp, each with the stamp of a Damaran noble house on one side and the year in Damaran reckoning on the other.

Powers
One of the most important properties of bloodstone was as a medicinal agent similar to the herb bloodstaunch. When a bloodstone gem was pressed on an open wound, it caused the blood to coagulate, the wound to close, and any blood diseases or poisons to be removed. No health was restored, but further injury from blood loss was prevented. The gemstone dissolved upon conferring its benefits, and a being could only receive this treatment once in a lunar cycle, i.e., another such treatment would not be effective until a month has passed.

Bloodstones could also be used as a substitute spell component for most divination spells and magics that were related to storms. One gem and one sprig of the heliotrope herb worked as material components for the invisibility spell.