A material design wedding ring icon would be nice
http://images.clipartpanda.com/wedding-ring-clipart-db0ff6e293b94596811d85f5795a2e9f_p_400.png
How about something like this?

diamond-ring.svg.zip
Here's an alternate version.

diamond-ring-alt.svg.zip
I believe that the outline would get lost at 24x24. Very good though.
Nice and clean. Will check about the size when I get home.
Most helpful comment
How about something like this?

diamond-ring.svg.zip