Uneek Oval Diamond Engagement Ring with Mixed Double Halo and Pave Double ShankIn this exquisite, very original double halo engagement ring style, designed to hold a 7. 5 x 5. 5 mm oval center stone, the outer halo (which is actually a continuation of the curvy "Silhouette" double shank) is U pave, while the inner halo carries larger shared prong set round diamonds so it has a scalloped looked; from Uneek's Silhouette Collection.