This Simon G. wedding ring set is available in either 18k gold or platinum. Pictured here with matching band, the semi-mount is also available by itself. Total diamond weight in the ring is approximately 0.52 carats. We are a certified Antwerp Diamond Importer and would be happy to provide you with options for the center stone. In most cases, Simon G. rings must be made to order. Please allow 4-6 weeks.