How to pronounce “luster” in English

This fluorite here has a glass-like luster.

It had lost much of its luster over time.

And here's the gold luster dust.

He rolled into my office polished to a luster, with the stone-cold swagger of a boulder twelve times his size.

Let’s check out some cool minerals… The first property I notice is luster — how light interacts with the surface.

It would lose its luster if somewhere else, would say what the hell is this?

And then I'm going to hit it with a little gold luster dust.

The gold luster dust?

Aside from color, we’ve also ironed out some other qualities of gems, like brilliance, luster, transparency, and fire.