5 Carat Round Diamond Engagement Ring. This stunner of a diamond is nothing short of perfection. The center is F color SI clarity and has superior brilliance and scintillation. The center diamond is held in a platinum diamond mounting, which has over 1.0 carat of F-G SI color and clarity round brilliant diamonds. This ring and many just like it are available for purchase at our Newport Beach showroom in Newport Beach north of Laguna Beach and Corona Del Mar and East of Costa Mesa. Come see the largest diamond inventory in Orange County.