We ordinarily might think of industrial diamonds or some such when we first hear the expression "diamond dust". It can also refer to weather! How so?
Weird Hexagonal Diamonds From Another Planet Discovered on Earth
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Glittering Diamond Dust in Space Might Solve a 20-Year-Old Mystery
What Do You Know About Diamond Meaning? - Clean Origin Blog
Glittering Diamond Dust in Space Might Solve a 20-Year-Old
Thanks to a bit of diamond smashing, practical room-temperature
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Cosmic diamonds may be hidden in 'carbon onions