This is a lovely ring. The yellow gold is not hallmarked, but acid tested for 14K. There are 3 gold bands converging into one band at the back. The front has 10 Diamonds with a total ct. weight of 0.60ct. The red Spinel measures approx 6mm round with a total weight of 0.85ct. Spinel occurs in all colors, the favorite being a Ruby like red. Spinel is not a synthetic stone. The color of this Spinel is a rich red with some pink color. Ring size is 6. Weight is 3.1grms. I would date this great ring at c1950's-60's.