This Simon G. engagement ring is available in either 18k gold or platinum. Pictured in two-tone yellow/white gold, ring is also available in all white. Total diamond weight in the ring is approximately 0.27 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.