Tommaso Design Trillion Cut Genuine Blue Topaz Pendant Necklace 14 kt Yellow Gold Metal: 14 kt Yellow Gold. Dimensions: Width: 8.00 mm Length: 15.00 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. Blue Topaz: The Birthstone for December. Named from the Greek `topazos` meaning `to seek`. Topaz occurs in a wide range of colors, and is said to enhance spiritual potential, intelligence, creativity wisdom and wealth. 18 inch Chain in a matching metal will be included. Lifetime Warranty exclusively offered by Finejewelers. High End Jewerly Box and Gift Packaging