While small diamonds raise the class of your engagement diamond ring, the ones with bigger diamonds are perfect to give the ring a modern twist. Some of the unique designs for channel set diamond engagement rings are listed below. Princess Cut Diamond Accents If you want a blinggy  band with seamless, diamond-encrusted look, princess cut diamonds are better than the usual round brilliant ones. This is mainly because there will not be any gap between your gemstones with princess cut diamonds. Colored Gemstone One of the best ways to make your channel set diamond engagement rings unique is by adding a pop of color. For this, you can use a colored diamond as the main gemstone, preferably a vivid blue or pink. Pick a stone of decent size as well. Unique Settings There is no rule that you must curb the channel set diamond engagement rings into linear or straight designs. You can also set it in a coil, curve, or expand and taper pattern, in order to give it a trendy charm.