Light. Dark. Sparkle in between.
The center cabochon looks quite a bit like old ivory, but is in fact lucite. Since this brooch is over 2 inches in diameter, this is a Good Thing, as it is not heavy. Even with all the glass petal / claw beads around the edge, it is still very wearable.
The particulars: Peyote Bezel. Pin back. Large Purple petal beads around the circumference with a stitched bezel of 11º and 15º seeds.