Black 3D Models - Unity3D

I just recently started using Unity3D, and have imported this object from Sketchfab. When I imported it, it provided all the necessary textures and meshes, but it's all black as shown in the images below. It's the same case for any other object I try to add from the asset store. I've tried to fiddle with the light source, but that doesn't seem to work. Thank you in advance.

Edit: This is what my mesh properties looks like. I have selected "pearl_body" and it's still all black.

You need to expand your model in the Hierarchy(left panel) view untill you will see Mesh Renderer component in the Inspector(right panel). Then you will be able to set the material. Probably you will need replace lambert45G in the material view with BaseTexture. That should fix the problem.

You can read more about materials here, and about mesh renderers.