Gold ring, Au 375/1000 (9K white gold). With a spectacular, solitair blue diamond. Ring with luxurious detail, in the form of the beautiful diamond, represents a true love for life. Ring with elegant lines, with a touch of romance, for a woman loving exclusivity. Manual sorting grade. Commercial certificate. Jewel is inspected by State Assay Office (official state authority). Gemstone characteristics: Type: Genuine, natural gemstone - diamond. Country of origin: South Africa. Carat weight: 0.220 ct. Square (princess) cut, faceted. Dimensions approx. 3.39 x 3.25 mm. Color: Wonderful, middle dark blue - "vivid blue" (fancy). 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: 3,53. Refractive index: 2.417 - 2.419. 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. 1.5 mm.