16mm Round Chalcedony Cabochon

Stone Type: Blue Chalcedony – a cryptocrystalline variety of quartz
Colour & Appearance: Ranges from light transparent blue to soft sky-blue or milky tones, often with a smooth, waxy luster
Optical Effect: Colour commonly attributed to the Tyndall scattering effect
Composition: Silica mineral formed in volcanic and sedimentary environments
Hardness: 6.5–7 on the Mohs scale; durable but can scratch if not handled or stored carefully
Origin: Historically sourced from Turkey, with additional deposits in Brazil, India, Madagascar, and the USA
Use: Popular, affordable gemstone widely used in jewellery
Reputation: Often referred to as the “Speaker’s Stone” for its calming associations