This is what the Omega web site says:
"The inner decorative caseback ring, crafted from 18K Moonshine™ gold and blackened, features a partial world map of the American continent and a domed lunar meteorite inlay, representing the true proportions of the Earth and the Moon."
It specifically says it's a lunar meteorite.
Lunar meteorites are not brought from the moon or they would not be meteorites, but simply moon rocks. Lunar meteorites do fall to earth, and that is likely what has been used in this watch based on what Omega has written on their web site.
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