Pendulums in my Luna Series were charged and created during the new moon or the full moon. This enhances the metaphysical properties of the stones and aids you in your divining. 
The Tempest ~
While charging these pendulum under the New Moon a great thunderstorm developed. The elemental energy was amazing! There was lightening (fire), wind (air), rain (water), and mountains (earth). I was able to capture an image of the lightening from my studio as seen in the photo. 
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Let me know what you think!