The following information is from the website:- http://en.wikipedia.org/wiki/Cubic_zirconia
Cubic zirconia (or CZ) is the cubic crystalline form of zirconium dioxide (ZrO2). The synthesized material is hard, optically flawless and usually colorless, but may be made in a variety of different colors. It should not be confused with zircon, which is a zirconium silicate (ZrSiO4). It is sometimes erroneously called "cubic zirconium".
Because of its low cost, durability, and close visual likeness to diamond, synthetic cubic zirconia has remained the most gemologically and economically important competitor for diamonds since 1976. It is sometimes marketed under the brand name "Diamonique". Its main competition as a synthetic gemstone is the more recently cultivated material, synthetic moissanite
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Cubic zirconia, cubic zirconium or CZ are NOT natural gemstones. They are lab created to imitate the diamonds. White CZ is very popular because it is cheap and beautiful; this is the choice for the people who do not want to invest a large amount of money in the gemstones or they cannot afford to buy the natural diamonds so they buy jewelry with cubic zirconia in stead for the engagement ceremony or marriage ceremony, etc, however, the duration of beauty of the CZ ais much shorter than the diamond. There are various qualities, prices and colors of CZ. If you are the middle class people and want the other people to think that you are wearing diamonds, you should purchase the white CZ weight around one carat or less, because if you buy bigger than those, the others will know that they are not natural diamonds as the prices of the clean over-one-carat diamonds (rare stones) are expensive that some people cannot afford to buy.
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