Ethiopian opal, 2.344 carats

Technical details: Type: Ethiopian Opal (Opal) Weight: 2.344 carats Shape: Marquise (Marquise) Color: Black and multicolored Clarity: Unclassified (Uncategorized) Transparency: Opaque (Opaque) Hardness: 5.5-6.5 Treatment: Smoke Treated Origin: Ethiopian Certification: Electronic certificate (PDF) from Saudi Laboratory (MT) - website (www.mtgl.com.sa) The opal (Opal) is a semi-precious (amorphous) mineral of hydrated silica (Hydrated Silica), known for its great diversity in appearance. The most famous type is the precious opal (Precious Opal), which features a unique optical phenomenon called play-of-color, where iridescent flashes of different spectral colors change with the angle of view, due to light interference with microscopic silica spheres arranged. Common opal (Common Opal), does not show this phenomenon but comes in a variety of colors. Opal forms in cavities of sedimentary and volcanic rocks when silica-rich water solutions are deposited.