The most common design for the small diamond engagement rings features a round cut diamond of 0.4-carat weight on 22k yellow gold. The gemstone is secured in place using the four prong setting, so that the center stone is well emphasized.
If you desire for a blingy option, the best way is to choose a thin band ring that is entirely paved with melee diamonds. You can also elevate the design by adding a diamond of comparatively bigger size at the center. Note that it is better to channel set the diamonds in these kinds of petite diamond rings.
For a stylish option, you can choose an open-end platinum diamond ring that features two small diamonds at the end points. Else, go for a thin platinum ring with an elongated baguette diamond at the center.