What does 14K DO CZ marking an jewelry mean?

I wondered that too... I had found a ring that I thought was costume jewelry until I relaized it had a stamp on the inside of the band with that same thing. A place on eBay is selling a ring and this is what they say about it: "marked "14K" & "DQ CZ" which is the mark of the QVC TV original seller of this ring; 14K solid gold QVC ladies CZ "Diamonique" ring". Not sure if this is 100% accurate or not, but it seems to make sense. Anybody know any better???