Problems

One of the obvious way to recognize a genuine CZ jewelry is by simply comparing price tag. Well, it may be true that a description of the product may be entrenched on the tag; but if not, it should be easy enough to know when the cz rings you are looking at are indeed made up of cz. Cubic zirconia or cz jewelry is way more affordable than diamond jewelry, you see.
In fact, it is cheaper than any diamond piece set in precious metal like sterling silver jewelry for making cz rings. This is because cubic zirconia is man-made, can be cultivated on a commercial level, and can be synthesized to outmatch natural occurring diamonds.
Take note the cubic zirconia ought to be differentiated from man made diamonds and even those improved ones. CZ are made up a crystalline zirconium dioxide and not allotrope carbon that is the main composition of the synthetic ones.
Aside from the price, there is really no other way to tell a cz from a real diamond – at least not from a naked eye scrutiny, that is. Trying to tell the two of them apart is like trying to gauge what is pure sterling silver jewelry from the silver plated ones. Try to think about sorting out a number of silver rings that are made out of .925 sterling silver and defining which one has pure silver content or has an alloy one. Even if your eyes are trained for the job, it is definitely impossible to do so.
Nonetheless, gemologists have a way of knowing what is cz from the real diamond. What the gemologists do is the simple thing of examining the diamond through its flaws. Yes, diamonds are hardly perfect, while cz can be engineered to perfection.
Diamonds have hazy, impure transparency and often have irregular cuts. It is part of diamond’s nature to have imperfections because they are geologically made this way. Also, impurities are often so deeply buried within that it is impossible to find a perfectly haze-clear diamond without impurities. And even the cut of the diamond (this mineral is extremely hard) are irregularly made.
Cz, as stated above, can be engineered to perfection, meaning that most pieces are perfectly clear, with no traces of impurities what so ever. These CZ cuts are perfectly shaped to reflect the polished and luminosity of the regular and smooth gem. This is because the cz is not physically hard as that of the diamond.