A: Well they are really different finishes:
Luster - Luster (or lustre) is a pearlescent effect that is often applied to glass beads, and especially to seed beads. A luster effect gives beads a shiny, radiant glow. When applied to transparent beads, it helps light reflect many different colors.
Aurora Borealis - An aurora borealis (AB) coating, usually on only one side of a bead, gives off a rainbow-like array of colors. The colors are most apparent when a clear crystal has an AB effect. AB is most common in crystals, seed beads and czech glass.
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Answer provided by: Karla Schafer (12/22/2014)