Help with maker mark on ring

[SCOTTER6438]

I found a ring and I can not figure out what the stamps mean on the inside of the ring. it looks like a woman's silver eternity ring with diamonds all the way around it. The markings inside the ring read like this.... 8 N 925 CH.
I think the 8 is the size and the 925 is silver. However I cant find anything on the N or the CH. Can anyone help?

 

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[bigfoot1]

are you sure the ch isnt cz..cubic zirconia...a common marking?possibly an error.also possibly a country of origin abbreviation