Below are some of the best diamond engagement ring designs that you can try to make your special day even more special, but staying within an affordable range. Rose Cut Twig Diamond Ring This is one of the unique engagement diamond rings. Here, a rose cut diamond of any fancy color and respectable carat size is used as the center stone. Furthermore, a unique twig shaped band of antique gold metal is used to highlight the diamond and to add to the overall look of the ring.     Vintage Diamond Ring With Precious Stones Most vintage diamond ring features precious stones or the gemstone other than a diamond as the focal point. In this type of designs, a huge precious stone at the center is accentuated with a halo of accent diamonds around it. The band is also paved with a multilayer of melee diamond up to the half to trim down the cost.   Three Stone Diamond Ring Three stone diamond rings also helps to cut down the price of your diamond engagement ring. Here, a medium-sized diamond is used as the main gemstone and is flanked by precious stone or smaller diamonds on either side. This will make the diamond look bigger, but for an affordable price.