Bloodstone is a dark green chalcedony that's also known as heliotrope.
The red markings in bloodstone come from inclusions of iron oxides, mainly from the mineral hematite.
These dark marks spots were once likened to the blood of Christ.
Bloodstone has long been used as an amulet to stop bleeding. During the Middle Ages, it was believed to control the weather, banish evil thoughts and direct spiritual energies.
The colour of bloodstone is always natural because when heated, the green chalcedony turns grey, and the inclusions of iron oxide turn black.
AVENTURINE
