Bloodstone is microcrystalline quartz which has red flecks that resemble blood splattering against a contrasting dark green body colour of which both colours are derived by iron oxide colouring.   
It is a popular gents ring stone and is generally cut into cabochons, beads or buff-tops that are available in a variety of shapes and sizes.  Blloodstone is usually untreated.   
The bloodstone stocked by is high quality, German cut material.

Care - No particular sensitivities.