"The One Ring burned Isildur, if my memory serves, because it was still hot from Sauron's hand. If it burned those 'to whom it did not belong,' then wouldn't it have burned Gollum and Deagol and Bilbo and Frodo and Sam?"
According to the Unfinished tales Isildur continued to be afraid to touch the ring on his journey to Rivendell. Also it said in the Unfinished Tales(which is why I mentioned it) that Saruman prepared a box to carry the one ring in if he ever found it(he thought it was where Gollum found it but he did not know it had been found by Gollom) which is similar to what Isildur did. I think it did not burn the Third Age ring bearers because they were permitted to carry the ring. I think the same goes through with those in the Simarils. Beren and Luthian earned the right to have the Simarils but because of their trechery Feanor's sons did not.
|