User blog comment:Silkworm Bot/Unpopular Opinion/@comment-2054732-20170311210014/@comment-2054732-20170312035944

Also don't confuse durability with hardness Diamonds are much harder than most other gems, but their perfect clevage means they can easliy be shattered instead of being scratched. Corundums on the other hand are both hard and durable, they have no cleavage meaning they are actually much harder to break than diamonds. Also Sardonyx is still a crystal gem and doesn't shatter, as she is part ruby herself she would no how hard she could swing her hammer without causing shattering.