Light Blue Obsidian in general is a protective stone, though the blue version does not have the grounding qualities of most of the others. Rather it boosts intuition and insight, and improves psychic communication, so this pendulum will be exceptionally useful in personal development work at a spiritual level. Be warned, though - blue obsidian is not for the faint-hearted. It will flush out anything that hinders your growth somewhat emphatically.
OBSIDIAN LIGHT BLUE