A easy/beginner way to detail the plastic rings made by Shapeways.
Video Version for metal rings HERE
I recommend water based acrylic paint and markers for beginners since it's easier to work with and clean up/fix mistakes. More experienced crafters can use their preferred paint type/detailing method. Step 3 will take more time and effort on the WSF material since it "holds" paint better than the WD material.
For metal pendants and rings I recommend doing steps 2 and 3.
If you want the color details on your metal rings, do steps 4 and 5 (skip 6) but use high quality enamel paints for models (diecast/metal model paint best choice).
I recommend oil based enamel for coloring the raised areas on the metal versions of the rings due to its bond strength. The raised areas must be durable high quality paint or clear coated otherwise the accent colors will quickly wear off.
(To Enlarge Pic: Right click picture and pick Original)