Bloodstone is a type of chalcedony, also known as heliotrope. The small spots of red jasper that form in the green chalcedony resemble blood splatters. Each set of 7 polyhedral dungeons and dragons dice comes with a padded case with a display window. All stone/fossil dice are handcrafted, and spin-tested and calibrated for precision and accuracy. Please roll your stone dice on a padded surface to protect them and your table. Due to the natural material of the fossil/stone, the exact coloration and pattern will vary.