Tommaso Design Oval Genuine Opal Earrings Studs 14 kt White Gold Metal: 14 kt White Gold. Dimensions: Width: 4.00 mm Length: 6.00 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. Opal: The Birthstone for October. From the Greek `opallios`, meaning `colour change`. A symbol of hope and faithfulness for the rainbow locked within it, it inspires true love and brings confidence. Additional Stones: