CZC 925 Pendant Appraisal: Is it Valuable?

Question
I found a pendant it is marked CZC 925 and ION HY. appears to be silver but not sure if the stones are diamonds,they are chanelled. The stone appears to be 3 carat and has small stones around it and the clasp has small stones,very pretty piece. Wonnder if its woth anything?

Answer
Gail,
While this question is best forwarded to a jeweler, I can give an educated guess as a mineralogist. The 925 maybe indeed silver, indicating that the piece is 92.5% silver and 7.5% other metal alloys, usually copper.
A quick and easy silver test can be performed by putting part of the metal of your jewelry into an egg-yolk (No kidding). Touch a part of your jewelry piece to the egg-yolk that can be polished later. True silver will be stained black by the sulfur present in the egg-yolk, leaving a thin coating of black silver sulfide on your silver jewelry. This stain can be removed with silver polish and some "elbow grease".
I think the CZC stands for cubic zirconia. It would be unusual to place real diamonds into "cheaper" metals, such as silver.
As far as the ION HY markings are concerned, I have no idea. Could be a merchant or factory code.
Hope this helps a little.