What is the second hardest material after diamond?
What is the second hardest material after diamond?
user
I’m not sure, could you tell me about the context of this question?
assistant
Are you familiar with the Mohs scale of mineral hardness?
user
I’m familiar with it, it measures the scratch hardness of different minerals, for making jewellery.  So the answer to your question is “The second hardest material would be the next stone on the Mohs scale.
assistant
Which stone is that?
user
I’m not sure which stone is second-hardest.
assistant
There are several choices so some acceptable answers are boron and titanium and their derivatives.
user