This is a round cabochon-cut, top royal-blue (with golden Pyrite flecks), natural Chinese Lapis Lazuli gemstone. It weighs 4.15cts and measures 10mm across.
Below is the technical information:
Size: 10 mm Shape: Round Cabochon-Cut Color: Top Royal-Blue with Golden Pyrite Flecks Clarity: Opaque Luster: Good Polish with Fine Glow Origin: China Hardness: 5 - 6 Specific Gravity: 2.70 - 2.90 Refractive Index: 1.50 Chemical Composition: (Na, Ca)8Al6Si6O24(S,SO4), Sodium Calcium Aluminum Silicate Sulfur Crystal Structure: Isometric
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