Not a diamond; this specimen appears to be industrial slag glass, obsidian, or a similar glassy/siliceous material showing typical conchoidal fracture patterns rather than a crystallized diamond or rough diamond crystal.
Not a diamond; this specimen appears to be industrial slag glass, obsidian, or a similar glassy/siliceous material showing typical conchoidal fracture patterns rather than a crystallized diamond or rough diamond crystal. · Rough / Uncut (Irregular nodule with conchoidal fracture)
Not applicable (Uncut rough material) Cut
Carat
Not applicable (Rough specimen, non-diamond material)
Color
Dark brown to black with blue translucent fractured window
Clarity
Not applicable (Opaque with internal fractures and bubbles)
Shape
Rough / Uncut (Irregular nodule with conchoidal fracture)
Overall Assessment
The specimen displayed in the image is not a diamond. It shows characteristic conchoidal fracturing, surface flow lines, and uneven texture consistent with industrial slag glass or obsidian rather than carbon crystal structure.
Cut Quality
Not applicable (Uncut rough material)
Brilliance
Poor to none (Low refractive index compared to diamond)
Fire
None
Scintillation
None
Proportions
Not applicable
Symmetry
Asymmetrical (Natural or man-made conchoidal fractures)
Polish
Unpolished (Natural/fractured surface texture)
Fluorescence
Not evaluated
Inclusions
Gas bubbles, flow lines, and internal fractures typical of glass or volcanic rock
Blemishes
Conchoidal chips and surface weathering
Origin
Industrial byproduct (slag) or natural volcanic glass (obsidian)
Treatment Detection
Not applicable
Estimated Value
Minimal / Nominal (Specimen value as mineral/glass curiosity only)
Certification Estimate
Cannot be certified as a diamond by standard gemological laboratories (GIA, IGI, etc.)
Investment Potential
None as an investment
Similar Diamonds
None (completely distinct material)
Setting Suggestions
Not recommended for jewelry due to low durability
Care & Maintenance
Store safely to prevent chipping of brittle edges
Interesting Facts
Conchoidal fracture surfaces on glass and obsidian often mimic the appearance of rough diamond windows to the untrained eye, but lack diamond's hardness and crystal structure.