I’ve looked at a few light (in color) round sapphires with different vendors and they all have a window in the middle of the stone where I can see the color of my skin. They are all telling me that this is normal for round sapphires, but it just doesn’t “show” in dark ones because the color is darker than the color of my skin. I don’t know if I’m just unlucky and have been shown bad stones, or if this really is normal for light round sapphires??