The most helpful quote about destroying the Ring comes from Gandalf, where he says: But there is no smith's forge in this Shire that could change it at all. ... So Feanor, despite his talent and many inventions, probably would not have been able to use his skill to destroy the Ring.

Can silmaril destroy the One Ring?

No. No one could except for, maybe, Aule himself. Not because of lack of craft, but because the ring would quickly become too to precious to destroy. Frodo himself could not destroy the Ring in the end, I doubt that Feanor could.

Who was stronger fingolfin or feanor?

Fëanor was the mightiest in skill of word and of hand, more learned than his brothers; his spirit burned as a flame. Fingolfin was the strongest, the most steadfast, and the most valiant.