Below are some of the amazing designs that you may consider for ruby diamond engagement rings.       Halo Ruby Diamond Ring In this design, a platinum ring flaunts a halo setting. Here, a huge ruby stone is given at the center of a ring, which is encircled with melee diamonds in order to highlight the center stone better. Three Stone Diamond Ring In this type of ruby diamond engagement rings, a ruby of a decent size is displayed at the center of a 22k yellow gold ring. It is further flanked with baguette accents of comparatively smaller size on either side in order to lift up the overall appeal of the sparkler. Ruby Diamond Ring Band A simple platinum band embellished with gemstones is perfect for couples who like to keep it subtle without compromising on its utmost elegance. Here, diamonds and rubies are paved on a thin platinum band in an alternating pattern.