Diamond (Rough)

Hardness: 10 (Mohs scale), Color: Typically colorless or transparent, but can come in various colors due to impurities (blue, yellow, pink, green, brown, black), Luster: Adamantine (brilliant, reflective), Crystal structure: Isometric (typically octahedral, dodecahedral, or cubic forms), Cleavage: Perfect octahedral (but rarely observed due to extreme hardness), Specific Gravity: 3.5-3.53

Formation Process: Diamonds form in the Earth's mantle (approximately 150-200 km deep) from carbon-bearing fluids under extremely high pressure (45-60 kilobars) and high temperature (900-1300°C). They are brought to the surface through volcanic eruptions often associated with kimberlite and lamproite pipes. Geological Age: Most natural diamonds are between 1 billion and 3.5 billion years old.

Industry: Used in cutting, drilling, grinding, and polishing tools due to their extreme hardness. Also used in high-precision machinery, medical instruments, and electronic devices. Jewelry: Highly prized as gemstones in rings, necklaces, earrings, and other ornaments due to their brilliance and durability. Collecting Value: Rough diamonds are collected for their natural crystal forms, or as investment opportunities.

Diamonds are the hardest known natural material. They form deep within the Earth's mantle under extreme pressure and temperature. The word 'diamond' comes from the ancient Greek word 'adamas', meaning 'unbreakable'. Diamonds have been used as symbols of wealth, love, and power for centuries. Famous diamonds include the Hope Diamond, Cullinan Diamond, and Koh-i-Noor Diamond.

How to Identify in the Field: Due to its extreme hardness, a diamond can scratch any other mineral. It has a distinctive adamantine luster. Rough diamonds often exhibit characteristic octahedral or dodecahedral shapes. They are often found embedded in kimberlite or lamproite rocks, or as alluvial deposits in riverbeds. Common Locations Found: Major diamond-producing countries include Russia, Botswana, Canada, Australia, South Africa, Angola, and Democratic Republic of Congo. Tips for Collectors: Look for distinct crystal habits and exceptional transparency. Be aware of synthetic diamonds and simulants when purchasing.