Cubic Zirconia or Diamond?
Cubic zirconia—commonly called CZ—is widely used as an inexpensive diamond substitute. To the untrained eye, a brand new CZ looks like a real diamond (well, Grade AAAAA). This is why many people substitute them for the real thing. CZ’s are not naturally occurring. CZ’s are grown in a lab. A CZ is not as durable as a diamond.
A few things you can take note about Cubic zirconia:
Cubic Zirconia stones are rated from A to AAAAA. A is the Lowest Quality, while AAAAA is the Highest Grade available. There’s a difference in the look and the price between the Lowest and Highest Grade, and there’s a market for them all. You should understand the difference to make the proper choice when selecting a CZ stone.
To the naked eye, a diamond and a cubic zirconia can look exactly the same (well except to a professional) —that’s the idea, after all.
Cubic Zirconia are not as hard as Diamonds so they can get scratched easily and become dull and lifeless over the long term, make sure there are no surface scratches.
Another easy test is to breathe on the stone. Diamonds don’t retain heat, so they’ll become almost instantly clear again. Cubic zirconia tends to retain heat longer than a diamond and will stay cloudy.
(A few more professional test can be conducted)
CZ's are not fakes, they are just not Diamonds.
A Cubic Zirconia may or may not be the answer for an engagement ring depending on you budget and its definitely not for investment buying, but they have a definite position in the marketplace. Understanding the facts about CZ's and how they differ will make you a more knowledgeable and successful shopper.
But if your heart’s set on a diamond then refer to my previous post on Diamonds and start doing your research.