Save your $699 and just dump any girl that pulls this shit. You boys make it sound so complicated.
Were I a dude, after I was done reveling in the ability to pee while standing, and mourning the ability to masturbate without needing to foul an innocent sock, I'd ask every girl I dated (not on the first date, but no later than the 6th), as causally as possible what she thought of the ring on the hand of the waitress/barista/movie ticket attendant/whatever. If their answer was anything other than, "I've never really given any thought to rings" and/or "I'm not really into jewelry", I'd mention needing to head home early to tend to some weeping sores, then thank my lucky stars, and go home to find a relatively uncrusty sock.
It's not as difficult as you all make it seem to weed out the ones who will make you crazy.
<---- has never seen the Notebook