A filigree ring with mounting for three 2.5mm round faceted gems. Designed by my wife.
Gemstones not included, alternate sized stones possible.
After several years of wearing this ring constantly, it is still holding up well (silver, I don't know how well the other materials will work). It bends a bit if I grip anything hard, but it still fits my finger and the stones are still securely mounted and everything is holding together.
If you would like to purchase this ring in plastic, see this page: http://www.shapeways.com/model/1401503/