Tommaso Design 7mm Cushion Cut Simulated Emerald Engagement Solitaire Ring 10kt Gold Metal: 10 kt White Gold. Dimensions: Width: 8.00 mm Length: 8.00 mm This Classic creation is made by the renowned Tommaso Design Studio. Tommaso Design Studio, is a reputable American Family Business based in New York since 1986, uses the highest quality materials, and will proudly stand behind all of its products. Simulated Emerald: The Simulated Birthstone for May. From the French `esmeralde` meaning `green gem`. A symbol of immortality, it is said to improve memory, wisdom and intuition. To the Romans, emeralds symbolized nature and aid fertility.