As mentioned above, this is a Round Cut .50 Ct. genuine Moissanite 4 Prong Solitaire Engagement Ring with a 14K Gold band. It was size 6 when first bought. I believe it is now 5. My sincerest apologies on the missing certificate of authenticity. I threw it out a long time ago thinking it would not be relevant. Boy, was I wrong. Retail was $399.95. All sales are final.