Talk:Emerald/@comment-24863788-20170725192321/@comment-26503751-20170725232636

To be honest the SU crew is good writting histories, but they no know nothing about gems. For that reason the show have a lot of mistakes. For example: They put the Bismuth as a gem. But the bismuth is a transition metal. They put the bismuth as a strong "gem". But the bismuth have 2.25 of hard. They think than the chalcedony and quartz are the same thing. Although both are SiO2 but have different molecular structure. This difference makes chalcedony more fragile than quartz. They think the rubies and sapphires are different things. But they really are the same thing (corundum) with different color. They put the rubies and sapphires as weak gems but actually the corundum have 9 of hard, wich is almost as hard as a diamond (diamonds have a hardness of 10).

I'm not surprised than they made another mistake. :P