The actor, who is The Huntsman in the fairytale epic, praised Stewart for the "detailed" approach she takes to acting.
"Kristen is so detailed in her approach," Hemsworth said, reports Flicks and Bits. "She has a real strong sense of the truth in the scene, and unless she believes it, it's not gonna happen, you know? She's got to find out, 'What are we doing, why are we doing it?' She's so detailed."
Hemsworth went on to suggest that co-star Theron's portrayal of The Wicked Queen will truly frighten moviegoers.
"Charlize is intimidating as The Queen. There's no doubt that she would scare the hell out of you if you were standing opposite her," the star commented. "When she's sitting up on the throne, she has this icy, cold, evil stare that she throws at you. I wouldn't want to fight her."
Hemsworth and wife Elsa Pataky welcomed a baby daughter named India Rose Hemsworth over the weekend.
Snow White and the Huntsman opens in cinemas on June 1 in the US and the UK.
Watch a trailer for Snow White and the Huntsman below: