Switch-It Gems Pendant Necklace with 12 Interchangeable Simulated Birthstones Guaranteed Authentic from the Switch It Gems designer line Metal: 925 Sterling Silver. Dimensions: Width: 14.00 mm Length: 22.00 mm Simulated Blue Topaz: The Simulated 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. All original Switch-it gems products come with a free limited Lifetime Warranty. Additional Stones: (cubic-zirconia, Shape: round-shape, Color: Colorless.)