Lady's Vintage 11-12ct Fancy Orange Synthetic Sapphire & Diamond Ring. Ring Size: 3 1/2 Contains One Emerald Cut Fancy Orange Synthetic Sapphire weighing 10.50ct. Contains Forty-Six Single Cut Diamonds. This rare orange sapphire is a synthetic. The reason I say rare is because orange sapphires are rare in their natural state as well as in the synthetic state and are never this large. It is obvious that this ring has some age and it has fared very well over the years, no nicks, dents, or scratches. Either natural or synthetic, it is a very hard and durable stone and simply beautiful.