Silver Cubic Zirconia Halo Cluster Ring. A striking cluster display of cubic zirconia stones set in sterling silver and completed with double row shoulders to frame the finger perfectly.This ring is also part of our proposal collection, so if you’re not sure on the type of engagement ring your loved one would want, why not pop the question with this beautiful ring. And, if you go on to choose your diamond engagement ring within 60 days, we’ll refund the cost of your Proposal Ring. See our terms and conditions.