Hi again, and you're most welcome.
Thanks for your patience, as I was offline when you replied.
A 'lab created/lab grown diamond' is made from the same material (carbon) as a real (mined) diamond, so yes, you are absolutely correct, that 'molecularly' they are the same. A CZ, on the other hand, is a 'synthetic' diamond, not made from the same material
as a real diamond, so although it may also technically be created in a lab (because it wasn't created by nature), a CZ is made from crystalline zirconium dioxide and is typically not labeled as a 'lab grown' diamond.
If the ring you bought on eBay was called 'lab grown' or 'lab created', this term is typically used to refer to a diamond made from carbon, which undergoes the same process as a real, 'mined from the earth' diamond, except 'man' speeds up the process with intense heat and pressure and/or other processes, to create the finished product. If the ring was advertised as 'lab grown' but is a CZ, this is not made of the material that real diamonds are made of and will not appear or wear the same, over time. Initially, the CZ IS as sparkly and beautiful as the real diamond it is made to resemble; however, over time the stone becomes cloudy and the quality diminishes.
If the ring you received stated it is 'lab created' and it IS a CZ, it sounds like the seller was trying to represent the stone as something it technically isn't. If you were searching to buy a lab created diamond and not a CZ, you might want to ask for a refund, if you received a CZ.
I hope you were able to read the articles I included for you in my previous answer, so you can see the exact and detailed differences of each type of stone, as summarized above.
I hope this clarified the situation for you.
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Edited by Cher on 12/9/2010 at 7:04 PM EST