Not a diamond; appears to be industrial slag, dark glass, or a dark non-gem mineral matrix with a conchoidal fracture.
Not a diamond; appears to be industrial slag, dark glass, or a dark non-gem mineral matrix with a conchoidal fracture. · Rough / Irregular fragment
Not applicable (Rough / Uncut material) Cut
Carat
Not applicable (Not a gemstone diamond)
Color
Opaque Black / Dark Grey
Clarity
Opaque / Included
Shape
Rough / Irregular fragment
Overall Assessment
The specimen shown in the image is definitively not a diamond. Its physical appearance—specifically the conchoidal fracture, vitreous luster on the broken surface, and opaque dark matrix—strongly suggests it is a piece of industrial glass, slag, or a common dark mineral rather than a precious gemstone.
Cut Quality
Not applicable (Rough / Uncut material)
Brilliance
Poor / Non-existent due to opacity
Fire
None
Scintillation
None
Proportions
Not applicable
Symmetry
Not applicable
Polish
Not applicable (Natural or fractured surface)
Fluorescence
Indeterminate / None visible
Inclusions
Dense internal impurities, fractures, and bubbles typical of glass or slag
Blemishes
Conchoidal fracture marks, chips, and surface wear
Origin
Synthetic industrial byproduct (slag) or terrestrial dark glass
Treatment Detection
None required; raw non-gem material
Estimated Value
Nominal / Zero monetary value as a gemstone
Certification Estimate
Not certifiable as a gemstone by standard gemological laboratories (GIA, AGS, IGI)
Investment Potential
None
Similar Diamonds
None (this is not a diamond)
Setting Suggestions
Not suitable for jewelry settings
Care & Maintenance
No special care required
Interesting Facts
Conchoidal fractures like the one seen in the image are characteristic of amorphous materials such as glass or obsidian, easily distinguishing them from the crystal cleavage planes of diamond.