www.925-1000.com

Could it be that the "S" is the ring size? I just read the section about ring sizing in the top list on the home page - all the articles on silver, too- and I noticed that the English use letters to indicate sizes... don't know if that helps, but it can't hurt!
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I know the cameo is made in Italy, it's stamped 925, then stamped Italy, (and a sticker on the back says 'made in Italy - that was easy!) but next to it is another indent section with a 5 point star, the numbers 351 (or 361, hard to tell) and either NA or NO. I know it's the maker and region - but ...

I've been doing a lot of research about asian jewelry lately, if it's kinda plastic-y looking and not a hard stone, it may be cinnabar... hope that helps, I'm still learning!

Or it could be a funny looking hand... It's on a bracelet clasp, the bracelet has 21 seperate oval stones in a 925 silver setting. The stones are a kind of peach color, but I don't know enough about jewelry to say what the stones are, and I don't have a digital camera available to me right now to ...