NOTE: Not to be confused with the earlier Golden Age Star Sapphire (https://community.cbr.com/showthread...-Star-Sapphire) who originally was a foe of Golden Age Flash (Jay Garrick).
First appearance of Carol Ferris = Showcase #22 (September-October 1959):
First appearance of Carol as Star Sapphire = Green Lantern #16 (October 1962):
And from Who's Who: The Definitive Directory of the DC Universe Vol. XXII (December 1986):