Got a question about LPD? Check out our FAQ (Frequently Asked Questions) What is the "AB" finish you talk about on CarCarats™? What is the "AB" finish you talk about on CarCarats™? AB (aurora borealis) - this finish is where a color has been coated with a finish called AB. The AB finish is an outside coating on an existing crystal color that covers about half of the crystal face. When you turn the crystal you will see the crystal color on one side and the AB finish on the other. For more information on Swarovski® crystal colors and finishes, please see http://reviews.ebay.com/Swarovski-Crystal-Beads-Finishes-amp-Effects-Part-1_W0QQugidZ10000000000120714?ssPageName=BUYGD:CAT:-1:LISTINGS:2