High quality tumblestones at 2-4cm in size. You can either buy these as single stones, or benefit from quantity discounts by purchasing larger amounts.
The mineral Heliotrope, a.k.a Bloodstone, is a form of chalcedony. The “classic” bloodstone is green chalcedony with red inclusions of iron oxide or red jasper. Sometimes the inclusions are yellow, in which case the mineral is given the name plasma.