Natural rough mineral sample (likely carbonado or dark bort diamond, though photographic texture strongly resembles a heavy industrial-grade crystalline matrix or slag/glass; assuming gemological context as rough diamond or heavy industrial diamond)
Natural rough mineral sample (likely carbonado or dark bort diamond, though photographic texture strongly resembles a heavy industrial-grade crystalline matrix or slag/glass; assuming gemological context as rough diamond or heavy industrial diamond) · Rough crystal / Uncut natural form
Not Applicable (Uncut rough stone) Cut
Carat
Estimated 15.0 - 25.0 carats based on visual mass
Color
Fancy Dark Gray to Black (Natural)
Clarity
I3 / Included (Heavy surface etching, inclusions, and fractures visible in rough state)
Shape
Rough crystal / Uncut natural form
Overall Assessment
An intriguing, dark rough diamond specimen showcasing raw geological formation characteristics, surface etching, and heavy natural texture ideal for mineral collectors or industrial applications rather than traditional jewelry
Cut Quality
Not Applicable (Uncut rough stone)
Brilliance
Low due to opaque dark body color and rough, unpolished state
Fire
Negligible to none due to opacity
Scintillation
Minimal, localized reflection from natural crystal faces
Proportions
Not Applicable for rough stones
Symmetry
Natural asymmetrical rough formation
Polish
Unpolished natural crystal surface with striations and rough patches
Fluorescence
None to Faint
Inclusions
Heavy internal clouding, feathers, crystal inclusions, and structural fractures
Blemishes
Natural surface trigons, etching channels, pitting, and rough skin
Origin
Alluvial or primary kimberlite pipe deposit (Africa, South America, or Russia)
Treatment Detection
None detected; appears completely untreated in its natural rough state
Estimated Value
$500 - $2,000 depending on exact composition, weight verification, and collector interest
Certification Estimate
GIA or specialized industrial diamond grading facility (Grade: Natural Rough Industrial/Specimen Diamond)
Investment Potential
Low for liquidity, moderate to high as a unique collector's mineral specimen
Similar Diamonds
Industrial carbonados, rough industrial boart, heavy inclusion-heavy dark diamond specimens
Setting Suggestions
Wire-wrapped pendant, custom organic bezel setting, or kept as a raw mineral specimen
Care & Maintenance
Store separately to prevent scratching other stones; avoid harsh chemical ultrasonic cleaners due to internal fractures
Interesting Facts
Dark and black rough diamonds often contain high concentrations of graphite or microscopic mineral inclusions trapped during rapid mantle crystallization billions of years ago