Not a diamond; appears to be industrial slag glass, obsidian, or heavily fractured dark mineral/rock rough lacking diamond crystal habit and cleavage.
Not a diamond; appears to be industrial slag glass, obsidian, or heavily fractured dark mineral/rock rough lacking diamond crystal habit and cleavage. · Irregular raw rough / unpolished nodule
Not applicable (rough, uncut, unpolished specimen) Cut
Carat
Cannot be accurately estimated from photograph alone without scale and density testing, but appears substantial as a mineral specimen.
Color
Dark gray to opaque black with surface reflectivity
Clarity
Included / Imperfect (opaque with numerous internal fractures and inclusions)
Shape
Irregular raw rough / unpolished nodule
Overall Assessment
The specimen in the image is definitively not a diamond. It displays physical characteristics typical of rough glass, slag, or a volcanic mineral like obsidian, featuring prominent conchoidal fractures and a lack of standard diamond crystal morphology.
Cut Quality
Not applicable (rough, uncut, unpolished specimen)
Brilliance
Poor to none (material is opaque and lacks diamond facet light return)
Fire
None
Scintillation
None
Proportions
Not applicable to rough mineral specimens
Symmetry
Asymmetrical (natural or fractured raw form)
Polish
Raw, unpolished surface showing conchoidal fracture patterns typical of glass or obsidian
Fluorescence
Unknown (requires UV testing)
Inclusions
Heavy internal fracturing, particulate inclusions, and internal stress cracks
Blemishes
Surface chips, natural irregularities, and fracture planes
Origin
Terrestrial mineral or anthropogenic glass/slag
Treatment Detection
No enhancements detected; raw untreated material
Estimated Value
Nominal / Mineral specimen value only (negligible monetary value as a gemstone)
Certification Estimate
Standard gemological laboratories (GIA, AGS) would issue a report identifying this as non-diamond material (e.g., glass, slag, or obsidian).
Investment Potential
None as an investment asset
Similar Diamonds
None (this is not a diamond)
Setting Suggestions
Not suitable for jewelry settings unless carved as an ornamental specimen
Care & Maintenance
Store carefully to avoid chipping brittle conchoidal edges; clean with mild soap and water
Interesting Facts
Conchoidal fracture patterns visible on the surface strongly resemble glass or volcanic obsidian rather than crystalline diamond structure.