Your link to ebay does not work on my computer. As I see the color of this stone on my monitor, it is a light blue with a bit of gray and green in it, maybe “slightly greenish blue” with a slight gray modifier. As such, if it is beryl, it is aquamarine. Rather than call it bicolor, I would call it zoned blue aqua. If it is actually clear in one part, perhaps you could call it bicolor aqua, but it isn’t a particularly sought after bicolor, being clear and greenish blue. You don’t give a weight for the stone, but by the scale of the fingers, I’d say it’s 5 grams or so. If it is clean, maybe $20/gm, but that is just a guess. You can call it anything you want on ebay, and maybe somebody will bite, but I’d suspect it’s worth in the $10 to $25/gram range.