The light of the Silmarils was the only remain of the trees. So, if the Valar controlled it, they could bring back the light I think...
How was the size of a Silmaril? I believe it was said that Melkor catched them all with his hand, but he was bigger than a man. I imagine them somewhat egg-shaped, but smaller and thinner, standing at the top of Morgoth's crown...
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