Natural Industrial-Grade / Carbonado Diamond (Rough Specimen)
Natural Industrial-Grade / Carbonado Diamond (Rough Specimen) · Rough crystal / Irregular nodular mass with natural resorption features
Not Applicable (Uncut rough specimen) Cut
Carat
Estimated 5.0 to 8.0 carats based on visual scale in hand
Color
Fancy Dark Gray to Opaque Black (Carbonado type)
Clarity
I3 / Included (Opaque due to dense microcrystalline structure and numerous inclusions)
Shape
Rough crystal / Irregular nodular mass with natural resorption features
Overall Assessment
An interesting and unusual rough specimen of dark, highly included polycrystalline diamond (carbonado), valuable primarily for mineral collectors rather than traditional jewelry use
Cut Quality
Not Applicable (Uncut rough specimen)
Brilliance
Low to Non-existent due to opaque body color and lack of faceted optical design
Fire
None due to opacity
Scintillation
Minimal, limited to surface luster reflections
Proportions
Not Applicable for rough material
Symmetry
Asymmetrical / Irregular natural crystal habit
Polish
Unpolished natural surface showing resorption pitting and micro-grooves
Fluorescence
Inert (Typical for carbonado and heavily included industrial rough)
Inclusions
Densely packed graphite micro-inclusions, mineral inclusions, and internal porosity (characteristic of carbonado)
Blemishes
Natural surface pitting, resorption cavities, and irregular fracture lines
Origin
Alluvial or primary deposit in Central African Republic or Brazil (typical sources for carbonado)
Treatment Detection
No treatments detected; natural untreated rough specimen
Estimated Value
Low to Moderate collector or industrial value ($50 - $300 depending on exact composition and verification)
Certification Estimate
Specialized gemological report (GIA or similar) confirming natural polycrystalline diamond (Carbonado)
Investment Potential
Low liquidity for investment; primarily valued as a geological curiosity or mineral specimen
Similar Diamonds
Other natural carbonado specimens or industrial bort diamonds
Setting Suggestions
Wire-wrapped, bezel set in organic or rustic artisan jewelry, or kept as a raw mineral specimen
Care & Maintenance
Store separately to prevent scratching other stones; avoid harsh chemical ultrasonic cleaners if porous
Interesting Facts
Carbonados (black diamonds) are believed by some researchers to be of extraterrestrial origin due to their hydrogen isotope signatures and presence of nitrogen-vacancy centers