Kalsydoni Indian, 18.687 carats

Technical details: Type: Indian Chalcedony (Chalcedony) Weight: 18.687 carats Shape: Rectangular Color: Green Clarity: Uncategorized Transparency: Opaque Hardness: 7.5-8.0 Treatment: Dye treatment Origin: Indian Certification: Electronic certificate (PDF) from Saudi Laboratory (MT) - website (www.mtgl.com.sa) Chalcedony is a fine crystalline form (microcrystalline) of quartz mineral, composed of silicon dioxide. Chalcedony is characterized by its waxy or glassy feel and transparency ranging from semi-transparent to opaque. It appears in a wide range of colors, such as white, gray, blue, brown, and red, and often originates from the deposition of silica-rich solutions in rock cavities. Many gemstones, such as agate, jasper, and carnelian, are different types of chalcedony.