"... it’s a good idea to avoid the Instagram feed of Dannijo, a fashion jewelry line favored by downtown socialites and celebrities."
I'm impressed by the intrepid marketing here and the very extravagant bib necklaces (which go way out onto the shoulders, like epaulettes, and drape around the breasts, like a brassiere). You cannot find Dannijo necklaces on Amazon. (I checked.) You cannot even find a bib necklace that extensive. I don't know how much metal and rock you'd enjoy hanging from your neck, but I did search for bib necklaces. There's an awful lot of crap under that designation, and Valentine's Day is coming up. I don't want to steer you wrong. I think something like this is not what your wife/girlfriend is likely to want to think you think reminds you of her. This is a possibility, for the right person. And this or this. If she's adventurous (albeit not at the Dannijo level). This is one I'd pick if I had to have a bib necklace. And finally, if the 2 of you are all about Scrabble, I have located the perfect Valentine's gift.
ADDED: Here's the one I can wholeheartedly endorse. It's the official Althouse blog Valentine's Day present for 2013. Here's the official alternative.