Who's the maker of this gold ring- please help

[makocz]

I searched all the places I know of, even trademarkia but I just can't find the maker or the ring with simple mark 'ST'.

I would be much obligated for any clues or help.

Thank you

 

[VRBeauty]

This might be worth a look in the event that it's a U.S. manufacturer:

http://www.trademarkia.com/trademarks-search.aspx?tn="ST"