What are the jewelry markings 925 cw in a silver ring?

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I'm trying to figure out the CW part myself, but I know for a fact that the 925 means that the silver is 925 parts out of 1000 pure silver. 925/1000 is the standard for sterling silver as opposed to the standard of 999.99 for a coin or a bar of silver in order to be used as currency.

Often you will see 925 and Italy stamped on silver jewelry. If you do this most likely is real. If someone is going to go to the effort of making counterfeit jewelry they are usually going to do it with gold, so if your silver has a 925 marking chances are its good sterling silver.

Hope this helps you out.