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According to Asko Parpola, the Sanskrit Vajra- and Avestan Vazra- both refer to a weapon of the Godhead, and are possibly from the Proto-Indo-European root *weg'- which means \"to be(come) powerful.\" It is related to Proto-Finno-Uralic *vaśara, \"hammer, axe\", but both the Sanskrit and Finno-Ugric derivatives are likely Proto-Aryan or Proto-Indo-Aryan, but not Proto-Iranian, state Parpola and Carpelan, because of its palatalized sibilant.
[en.wikipedia.org]
Coincidentally or not the most intact examples of the ancients can be found in Asia as they appear to have weathered the ancient floods and disasters most successfully.
This is the emblem of the Kingdom of Bhutan which illustrates a spinning Vajra and the dragons/energy that it emits.
[en.wikipedia.org]