Rough Carbonaceous Material
Rough Carbonaceous Material · Rough/Uncut
None (Raw Mineral) Cut
Carat
Undeterminable - Specimen Scale
Color
Opaque Black/Grey
Clarity
Opaque (Non-gem quality)
Shape
Rough/Uncut
Overall Assessment
The specimen in the image is not a gemstone-quality diamond. It appears to be a piece of carbonaceous rock, such as shale or matrix containing graphite. It lacks the crystalline structure and refractive properties of a diamond.
Cut Quality
None (Raw Mineral)
Brilliance
Zero (Opaque)
Fire
Zero (No light dispersion)
Scintillation
Zero (No faceted reflections)
Proportions
N/A - Rough Stone
Symmetry
None (Irregular)
Polish
None (Rough)
Fluorescence
Assuming Inert (None)
Inclusions
Massive carbon and host rock inclusions
Blemishes
Natural surface fractures and matrix crust
Origin
Terrestrial Rock (Carbonaceous shale or coal-rich matrix)
Treatment Detection
None detected; appears natural raw mineral
Estimated Value
Minimal (Geological curiosity only)
Certification Estimate
Geological testing only; not suitable for gemological lab grading
Investment Potential
None (Non-gem grade material)
Similar Diamonds
Bort or Carbonado (though this is likely shale or graphite)
Setting Suggestions
Display specimen only; not suitable for jewelry
Care & Maintenance
Keep dry and avoid rough handling to prevent crumbling
Interesting Facts
Most black material found in common rocks is graphite or carbonaceous shale, not diamond.