Star K Sterling Silver 8mm Heart Shape Promise Engagement Ring. Metal: 925 Sterling Silver. Dimensions: Width: 8.00 mm Length: 8.00 mm This beautiful design is part of the exclusive Star K. Jewelry collection. Star K, is a reputable American Family Business based in New York since 1986, uses only the highest quality materials, and will proudly stand behind all of her products. White Topaz: The Substitute Birthstone for April. 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. Additional Stones: (cubic-zirconia, Shape: round-shape, Color: Colorless.)