"Diamond dust" is not the real name of a plant. It's actually a meteorological phenomenon that refers to tiny ice crystals suspended in the air, sparkling like diamonds in sunlight.

There are a few plants that have names similar to "diamond dust", but none are actually called that:

* Diamond Frost: This is a popular variety of Euphorbia hypericifolia, a flowering plant with small, white, star-shaped blooms.

* Diamond Head: This is a variety of Zinnia, known for its bright red blooms.

If you're looking for a specific plant, you'll need to provide more information about its characteristics or where you saw it.