Picture of 123D fashionable page markers
I've been working on this idea for a while. First, I was trying to make it out of wire, but the final product looked almost the same as my twisted ring. Since I already have a spin-off on that one, I didn't wan't to post a third ring with the same technique. So, it was forgotten. Until yesterday. I was thinking of something for the 123D contest when I remembered this idea. 
I used about the same sizes as with the wire ring I made first. The following part of text gives an explanation of what this is and why you would use it. The file is public, so you can modify it to make it fit for yourself. The instructable includes how to change it to your own size.
I hope you like it!

The idea behind it came when I was reading a book. Well actually, the idea came the moment I put the book down. I couldn't find my page marker, although I was sure I had it a minute ago. So I thought, how can I make sure I have my page marker, while reading the book, without risking to lose it? Of course: wear it! And, a small ring would give about the right size.

The ring has a total height of 0,22 cm. Reason it is so low is that it has to be in the book. The gap between the two parts is 0,02 cm, enough for any kind of paper. The two parts are held together with the circle on front and a small row of cylinders, also on the front. This will give just enough support for the rings to be one piece.

The 3D model can be found in the last step.

If you like this idea, I would really appreciate a vote in the 123D Autodesk contest.

Step 1: What to find where

Picture of What to find where
Step 2/6                    How to make the 3D model

Step 7/8                       How to modify the 3D model

Step 9                       Where to find the 3D model
MilaO1 month ago

I love this. Seriously LOVE.

emilyvanleemput (author)  MilaO1 month ago

Glad you do!

wobbler2 years ago
Great lateral thinking!
emilyvanleemput (author)  wobbler2 years ago
Kiteman2 years ago
Oh, I get the idea, a bookmark you wear as jewellery!

For functionality's sake, a slight bevel to the edges of the gap between rings would make it a lot easier to slide the paper in.
emilyvanleemput (author)  Kiteman2 years ago
Thanks for the idea!
Great idea, I like it !! I agree with Kiteman: a slight mod that would ease a page sliding in would make this design even better. Keep up to good work ;-)
emilyvanleemput (author)  pvltechnofreak2 years ago
Jaxton Maez2 years ago
What's the app called?
Visit 123dapp.com/design. There is a program for your PC or Mac, an in-browser web app, and an iPad app.

Emilyvanlessmput used the web app. There are download links for each version on web page I linked.
Ooh, I like that! Good idea :)
Thank you so much!