Gold ring, Au 375/1000 (9K yellow gold). With genuine, natural gemstone - blue topaz. Luxury ring, in elegant poetic style, of yellow gold that is adorned by the gemstone in the form of sky blue topaz. Blue topaz is the birthstone of the month of December and the annual gemstone of the 4th and 19th wedding anniversary. Blue topaz is a symbol of love and affection. The topaz helps to examine your own personality and inner wealth in the mental life. It forces you to trust yourself and act philanthropic, in effort to share your happiness with others and shine brightly all around. Topaz jewelry cleaning: The best way to clean topaz jewelry is by using mild detergent and warm water. Avoid cleaning with ultrasound or steam cleaners. Do not expose topazes to excessive heat or acids. Gemstone characteristics: Type: Natural gemstone - blue topaz. Country of origin: Africa. Carat weight: 0.55 ct. Round cut, faceted, diameter 5 mm. Color: Light blue. Clarity: IF - VVS. Luster: Excellent. Hardness: 8.0 Mohs. Specific gravity: 3.49 - 3.57. Refractive index: 1.606 - 1.644. Jewel is inspected and hallmarked by State Assay Office (official state authority). Pattern width ca. 7.5 mm, band width ca. 1.1 mm.