Gold pendant, Au 375/1000 (9K). With genuine, natural gemstone - mystic topaz. Beautiful pendant embodies minimalist elegance. Gemstone characteristics: Type: Natural gemstone - mystic topaz. Country of origin: Sri Lanka. Carat weight: 4.08 ct. Round cut, faceted, diameter 10 mm. Color: Rainbow. Clarity: VS. Luster: Excellent. Hardness: 8.0 Mohs. Specific gravity: 3.49 - 3.57. Refractive index: 1.606 - 1.644. Mystic topaz is created by special treatment of genuine, natural, colorless topaz - by plating a gemstone with microscopic layer of titanium. The plating process for titanium on topaz gemstones is protected by a strict patent protection, therefore there is a very limited amount of these beautiful gemstones available in the market. Diameter (loop excl.) ca. 10 mm, inner loop dimensions ca. 4.5x3 mm.