In general... meaning this, I don't think the average person has any idea what the Shar symbol looks like. It's probably a DC on a roll to figure out. Because Shar worshipers don't go around flaunting that they're Shar worshipers.
I would also guess that it's *typically* out of character for a Shar worshiper to wear their symbol so publicly.
Again, I think the average person, not even knowing the Shar symbol, would see a black circle of onyx and think jewelry.
Or possibly, because Shar worshippers are supposed to be secretive and don't wear their symbols publicly, people would see SH and just think she's being edgy. "She obviously can't be a true Shar worshipper; she's way too conspicuous! She obviously worships another god and just wants you to think she's cool and worships Shar."
