As I was eating lunch, I decided to see what Wikipedia had to say about Belit. Of course, it has a description of her as written by Howard:
"She turned toward Conan, her bosom heaving, her eyes flashing. Fierce fingers of wonder caught at his heart. She was slender, yet formed like a goddess: at once lithe and voluptuous. Her only garment was a broad silken girdle. Her white ivory limbs and the ivory globes of her breasts drove a beat of fierce passion through the Cimmerian's pulse, even in the panting fury of battle. Her rich black hair, black as a Stygian night, fell in rippling burnished clusters down her supple back. Her dark eyes burned on the Cimmerian."
Now doubt about the color of her skin and hair.