The substance must exist as a solid under normal conditions on earth.
A solid is distinguished by its structural rigidity and resistance to external forces. A solid substance, unlike a liquid, does not flow to conform to the shape of its container or, like a gas, expand to cover the entire space. The substance must be solid at ordinary temperature and be present as a solid under normal Earthly conditions.
The important thing is that solids maintain their structure and don't flow like liquids. If nothing changes, a rock will always look like a rock. A diamond is no different. Because their molecules are closely packed together, solids are able to maintain their shape.
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