Morwen Navarre said this quote

“ Gerry reached up to smooth a bit of that snowy mane. The strands slipped through his fingers like silk to reveal a witch's mark, a spiral of olive-green stones that seemed to be a part of Ghost’s very forehead, shining against the translucent skin. Gerry had seen such marks before, peculiar glyphs burned into a witch's skin in vibrant jewel-tone inks to offer protection or enhance their power, or so the witches claimed. This was the first time he had seen actual jewels used, though. He thought it was beautiful, exotic like all of Ghost, with that white hair and those ice blue eyes. Gerry returned to admiring the peaceful face resting on his shoulder. ”