Gold ring, Au 375/1000 (9K yellow gold). With genuine, natural gemstones - black diamonds, blue diamond. Luxury ring with an elegant silhouette made of yellow gold, which opens to the wonderful, solitaire blue biamond, surrounded by a sparking belt of black diamonds. Gemstone characteristics: Type: Genuine, natural gemstone - blue diamond. Country of origin: South Africa. Carat weight: 0.233 ct. Round, brilliant cut, faceted, diameter ca. 3.81 mm. Color: Wonderful, vivid blue. Clarity: SI2 (small inclusions, confirming the authenticity of diamond, are very difficult to spot with the naked eye, detectable under a magnifying glass with a minimum 10X magnification, inclusions do not impair the brightness and sparkle of the diamond). Luster: Excellent. Hardness: 10.0 Mohs. Specific gravity: 3.50 - 3.53. Refractive index: 2.417 - 2.419. Black diamonds VS clarity, manual sorting grade. Commercial certificate. Jewel is inspected and hallmarked by State Assay Office (official state authority). 18 pcs of black diamonds with brilliant cut, total carat weight ca. 0.077 ct. Avoid cleaning diamond jewelry with solution containing ammonia (cleaning is recommended with mild soap and soft cloth only, then dry on blotting background). Do not expose diamond jewelry to temperatures over 300 °C. Width of the band ca. 1.2 mm.