Cubic Zirconia CZ Silver Tennis Necklace Set ~ Bridal Start Price USD 67.00 Current Price USD 67.00 Time Left 9 days 7 hours 21 minutes Bid Count 0 Buy It Now Price - Reserve Price - Start Time Friday, September 19, 2008 End Time Saturday, January 17, 2009 Location Levittown, Pennsylvania See more about 'Cubic Zirconia CZ Silver Tennis Necklace Set ~ Bridal' Description Please Visit our Bridal Jewelry Store here on EbayFabulous CZ & Silver Vine Patterned Tennis Necklace SetBeautiful Elegant Intricate Bridal Boutique ~ Event ~ BoxedNecklace is 16 1/2" Long, Cluster Post Earrings are Nickel & Lead Free and 1" LongCubic Zirconia: (CZ) A clear, hard, mass-produced gemstone cut to resemble a diamond. The mineral baddeleyite has the same chemical composition, but to become a CZ the mineral must be heated to almost 5000 degrees Fahrenheit and have an oxide stabilizer such as yttrium or calcium added to keep it from reverting back to its original form when cooled. Almost all the rough CZ's in the market are composed of zirconium oxide and yttrium oxide, both of which are naturally white but combine to form a brilliant clear crystal. Like diamonds, the best cubic zirconia gems are colorless but colored forms are also manufactured.  Cubic zirconia gemstones are cut in the same fashion as diamonds, and like diamonds the size of the gemstone is usually indicated by its weight in carats. The stone can also be measured in millimeter diameter size. Because the cubic zirconia stone is so dense and solid, it outweighs a diamond of the same millimeter size, weighing 1.7 times more than a diamond of the same millimeter diameter. It is also not as hard as a diamond rating an 8 on the Mohs scale. Natural skin oils, soap, and dirt cause a film that dulls the beauty and luster of the cubic zirconia, just as it dulls real diamonds. The best cleaning agent for cubic zirconia is liquid dishwashing detergent, but other gem and jewelry cleaners can also be used. Place a Bid!