Not a diamond; this is a vitreous material displaying conchoidal fracture, highly characteristic of obsidian, volcanic glass, or industrial slag, rather than crystalline diamond.
Not a diamond; this is a vitreous material displaying conchoidal fracture, highly characteristic of obsidian, volcanic glass, or industrial slag, rather than crystalline diamond. · Irregular / Raw Concoidal Fragment
Not applicable (Natural conchoidal fracture surface, unpolished) Cut
Carat
Not applicable (Mineraloid / Volcanic Glass)
Color
Black / Dark opaque with iridescent sheen
Clarity
Not applicable (Opaque material with internal flow lines and fractures)
Shape
Irregular / Raw Concoidal Fragment
Overall Assessment
The visual evidence (pronounced conchoidal fracture ripples, glassy luster, and opaque dark body) confirms this is obsidian (volcanic glass) rather than a diamond or diamond simulation. It possesses no gemological diamond characteristics.
Cut Quality
Not applicable (Natural conchoidal fracture surface, unpolished)
Brilliance
Vitreous (glass-like) reflectivity on smooth fracture ridges
Fire
Absent (amorphous material lacks high dispersion of diamond)
Scintillation
Minimal to none, limited to surface light reflection on curved planes
Proportions
Not applicable
Symmetry
Asymmetrical due to natural conchoidal breakage
Polish
Unpolished natural fracture surface, vitreous luster
Fluorescence
None observed
Inclusions
Internal flow patterns, micro-crystallites, and feather-like strain cracks
Blemishes
Conchoidal ripples, sharp edges, and surface scratches typical of volcanic glass
Origin
Natural volcanic origin (obsidian) or manufactured glass slag
Treatment Detection
None; raw unaltered geological material
Estimated Value
Nominal value as a mineral specimen or decorative stone (typically under $20 USD depending on size and provenance)
Certification Estimate
Not gradable by standard diamond grading laboratories (GIA/AGS/IGI); requires geological or mineralogical identification.
Investment Potential
None; sold purely as a decorative or educational mineral sample
Similar Diamonds
None; this specimen shares no gemological properties with diamond
Setting Suggestions
Wire-wrapping or bezel setting in sterling silver or copper for artisan jewelry
Care & Maintenance
Handle with care to avoid chipping sharp edges; clean with mild soapy water and a soft cloth; avoid harsh acids and impact against hard surfaces.
Interesting Facts
Obsidian was historically used by ancient civilizations to create sharp cutting tools, arrowheads, and mirrors due to its extremely sharp conchoidal fracture.