Round brilliant cut diamonds are one of the most popular styles for engagement rings. Discover the stunning collection of diamond rings by Appleby Jewellers online and in store today. Our collection features everything from solitaire, halo and three stone styles, and are available with 18ct yellow gold, 18ct blush rose gold or platinum bands. Round brilliant cut diamonds are the quintessential and timeless dazzlers due to their outstanding light performance and universal shape that works in an endless number of settings.