"Huh? Sure I can," he said, blinking once and tilting his head a little to the side in curiosity at the question. When she held out the necklace, he reached out to carefully take it, bringing the broken area up closer to his eyes. "Hm... well, doesn't seem too hard to fix, to me at least. Though I guess I do do things a lot differently than anyone else I've seen..." he admitted, holding two fingers up. Around them steadily coiled a thin line of crimson fire, and a few moments later it was wrapping tightly around the broken area, occasionally shifting slightly. A short time passed of him being silent (which was not always so common, in truth), before that little fire faded away and he placed a few fingers over the tended-to part to cool it down a little less naturally but just as efficiently.
After all, to him his power over fire was not just about producing heat, but removing it as well.
"There... should be 'good as new,' as people say," he proclaimed with a little grin, offering it back to her.