RC = Royal Cut, a combination of high quality lead free machine cut and machine polished crystals & full-lead machined-cut crystals to meet a desirable showmanship of an authentic elegant crystal chandelier.
EC = Elegant Cut, Elegant Cut Crystal consist 30% of high quality full-lead machine-cut elegant crystal that is above industry standards.
SA = SPECTRA®CRYSTAL, reliable elegant crystal quality by SWAROVSKI
SS = Swarovski® ELEMENTS, Formerly branded as Swarovski®Strass. An exercise in technical perfection, Swarovski® ELEMENTS crystal meets all standards of perfection, possessing lead oxide in excess of 33%.