Seller: hawkeye_treasures (329) 98%, Location: default, NO, Ships to: Worldwide, Item: 184127916924 Rock CrystalRock crystal is the most common semi precious stone. It has in its purest form hardness 7 on Mohr's scale. Along with agate crystal seems to have been extensively used in ancient India for bead making. In spite of the fact that real transparent crystal was a scarce material, it seems that especially the Mauryan culture used it for a large number of items including beads. In the ancient Buddhist Indian stupas there has been found a lot of crystal beads in the burial caskets. The Indian crystal was also due to its quality exported to the Roman Empire.