Some years ago I worked in the Los Angeles Jewelry District for a diamond dealer. All of our salesmen carried cubic zirconia samples for their own safety. The rings were 18K gold plated over either sterling or base metal, and set with czs, colored and clear. I always bought the samples of rings no longer in the line. This ring is a double gold toned band, set with a large clear cubic zirconia - probably the equivalent of a 3 1/2 - 4 carat diamond. It is presently a Size 6. None of these rings have ever been worn - just carried around in sample cases, so the ring shank has no wear, and the stone is brilliant. These types of rings are great for those who like to wear jewelry when they travel or cruise, but don't wish to risk losing their real diamonds. In stores these kinds of 18k gold plated Cubic Zirconia rings are quite expensive, but because I got them from my diamond dealer friends years ago, I can sell them for much less and they really are exquisite.