Cubic Zirconia (CZ) Quality: Do They Cloud Over Time?

Question
Hi Peter.  you used to manufactor for QVC and I was thinking about getting a ring from there but they are cz's and all the other CZ'S I have had in the past had gotten cloudy over time, however QVC says their will not. And so do many other company's such as czjewels.com, ziamond.com and Carat.cc so are there diffrent qualties of cz's?  Are these companies really telling the truth when they say they will never cloud up of change color or loose their fire or brillance?  Or are they all telling a bold face lie?
Thank you for your time

Answer
HI AMANDA,

BELIEVE IT OR NOT THERE ARE DIFFERENT QUALITIES OF CZ BUT NOT LIKE YOU THINK. THE BIGGEST DIFFERENCE IS IN THE PREPARATION AND FINISH WORK ON THE GEMS. IF SAY A CUTTER WHO CUTS DIAMONDS CUTS A CZ IT WILL LOOK 100% BETTER THAN SOMEONE UNTRAINED. CHEAPLY MADE MATERIAL IS STILL CZ BUT NOT QUITE AS PURE AND IT WILL CHANGE COLOR. THESE GUYS CAN MAKE THESE CLAIMS BECAUSE THEY KNOW THAT 90% OF THE BUYERS WILL NEVER WEAR THEM LONG ENOUGH TO NOTICE AND IF THEY DO MOST WON'T DO ANYTHING ABOUT IT. THE VENDORS ARE REQUIRED TO GAURANTEE ALL THE JEWELRY FOR LIFE 100% OF THE TIME. SO THEY MAY HAVE TO REPLACE 5% OF THE GOODS. IT IS A NUMBERS GAME NOT REALITY. STONES CHIP, BREAK, TURN, GET CLOUDY ETC. USUALLY THE STONE GETS DULL BECAUSE IT IS NOT DIAMOND AND SCRATCHES AND EXPOSURE TO CHEMICALS CAN RUIN THE FINISH CAUSING IT TO LOOK "DULL". THESE COMPANIES BELIEVE THEY ARE TELLING THE TRUTH BUT DON'T REALLY KNOW. WHAT YOU NEED TO DO IS HAVE THEM GIVE YOU A WRITTEN GAURANTEE IT WON'T CLOUD UP AND IF IT DOES MAKE THEM REPLACE IT.

THANKS

PETER