How were the Three and the rest made?

[narfforc]

Of interest here are Feanors words about the breaking of the Silmarils: It may be that I can unlock my jewels, but never again shall I make their like; and if I must break them, I shall break my heart, and I shall be slain.........

This in some way mirrors Saurons demise upon the destruction of the One Ring, it is as if in some way they are both bonded to their greatest creations, of course there is no way to know if Feanor would have died and what exactly would have killed him, the emotions that he felt for The Jewels were bound to have some effect on him, or did he really put some of his spirit within them, how close are inner feelings of the being and spirit anyway.