Comrades, assemble! Help your girl find a silver ring online.

Guys I want to gift my niece who's turning 16 in march, a silver ring. She's my sister's daughter and very close to me. Where can I find authentic silver rings, with cute yet subtle designs? Like an infinity or something. Should not have a standout single stone on it. I hope you guys get the picture I'm trying to paint here.

Online because she's in Bangalore and i can't visit her then. The one's I'm seeing online are beautiful but not at all costly, which i presume is because they aren't authentic silver.

So how do I know what makes up an authentic chandi? Also is there some out and out websites selling only silver jewellery? A little bit of gold used will be nice as well, not necessary tho.

Any help will be appreciated 🙃