Just double-checked, Silmarillion was able to shed some light on the whole thing. A few extracts: From early in the section entitled, Of the rings of power and the third age: "Therefore The Three remained unsullied, for they were forged by Celebrimbor alone..." Entry from the index of names, a paraphrase of Celebrimbor; he is the son of Curufin, made the three elven rings. Curufin is the "fifth son of Feanor". Feanor made 3 Silmarili, which means "jewel" in one of the elvish tongues. I won't dispute the statement about Glorfindel; he had an disagreement with a balrog near the end of the first age, so he must have been a tough cookie.