I have seen this before. It was not supposed to be a wedding ring, just another standard ring. Also, the reason people like jewelry is because it's valuable by itself. If you can just print yourself another wedding ring, then what was so special about it in the first place?

http://nfcring.com/bitcoin/

Could be used as well.

It looks like a plastic piece of tat you would get out of a gumball machine. If you offered a plastic wedding ring to your prospective wife and said "will you marry me" she would probably refuse. No self respecting woman would be seen wearing a plastic wedding ring.

Your right, it looks like the icing they write stuff on cakes with, yum.

Anyone else try scan the QR code, didn't work for me, probably need a straight shot of the ring.

A ring with a slot to save the private key would work just as well.
I don't know what to make of this particular ring.

Not everyone like the QR code in a wedding ring. In my opinion, it's really ugly, if i use such ring to propose my wife, i may be refused. 
BTW, she is not a bitcoin fans.

Indeed, the ring in the OP should not be 3D printed, but atleast made out of gold with a more subtle QR code. Engagement rings should be nice to look at, not be a monstrocity.

You could have two seperate rings.. The one has the QR Code for the Bitcoin Address and the other the QR code for the private key. The Passphrase could be something only you and your partner knows. 

So the story goes.... Both of you contribute monthly to this Bitcoin address to save up for a 10 or 20 year anniversary gift or holiday or a second honeymoon.

When you have these rings made, nobody knows the Passphrase, so it should be relatively safe. 

Sounds like a good idea. 

If you have the private key you know the address as well.
If you have the address, that's all you got 

Most women get excited with things of value, diamonds for example.
However, in this case, judging by the OP picture, I doubt any woman would wear that ugly thing.