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Diamonds are naturally hard, but is there anything from Earth, space or even a lab that
RealJade™ Jade Education Blog, Grade A Jadeite Jade
Is obsidian the second hardest thing to diamond? - Quora
Superhard material - Wikipedia
Is anything harder than a diamond?
Superhard material - Wikipedia
Is a Diamond Truly the World's Hardest Material?
Harder than diamond, stronger than steel, super conductor … graphene's unreal
New Material Turns as Hard as a Diamond - The Lab World Group
Graphene-based material diamene becomes harder than a diamond upon impact - MaterialDistrict
Diamonds: the hard facts Pursuit by The University of Melbourne
Tungsten Carbide: Is It Harder Than Diamond?