Gems. Hadid's stone. Subsea antique objects

This video is about Hadid's stone or hematite. Hadid's stone is also called iron ore. And it's not a lot of difficulty. It's hard, it's between 5 and 6. And the specific weight of this stone is 5.9, and to distinguish the original from the back of a tile or ceramic or glazed container, and if it left a red color, it's the original stone.