Swarovski Siam Shimmer Effect from Rings & Things encapsulates pure luminance and celestial color. The durable, elegant crystal effect radiates 3 shades of the underlying rich translucent Siam red to accentuate the wearer’s every move, and provides for jaw-dropping glamour beneath the spotlight. Siam Shimmer 2X: Our Siam Shimmer 2X is a 3rd-party shimmer coating on a Swarovski siam crystal bead. Most coatings are on just one side of an item / bead. Beads with "2X" in the color name have the coating on both halves of the bead -- the entire bead -- rather than just half the bead.