“Stardust” as a marketing term was landed on after excluding alternatives such as “stripper glitter,” “unicorn pubes,” and “LSD LE”
To clarify, the above commenters may be correct as applied to the watch you were originally inquiring after; but as for other watches, such as the mega you posted,
“Stardust” is an actual type of dial that is not merely patina etc.
I’m not aware of the stripper glitt... I mean stardust being in models other than the mega, but that doesn’t mean there aren’t others; that said, the OP watch appears to be patina, not a true unicorn pu... stardust.