Bead Color / Finish Information
The following abbreviations (OP, M, TR, etc.) refer to the bead finish.  
Some beads may have more than one abbreviation, like TR MA.
L     = Luster : pearl-like finish
M    = Metallic : has a metallic look
MA  = Matte : frosted appearance
MR  = Metallic Rainbow : multiple color metallic, often called "iris"
OP  = Opaque : no light passes through the bead
TL  = Transparent Luster : light passes through the bead and it has a slight pearlized finish
TR  = Transparent Rainbow : light passes through the bead, with an Aurora Borealis (AB)   
       rainbow finish
TSL = Transparent Silver Lined : light passes through the bead, hole of bead is silver lined