Not a diamond; this appears to be obsidian or a similar vitreous volcanic glass, showing characteristic conchoidal fracture.
Not a diamond; this appears to be obsidian or a similar vitreous volcanic glass, showing characteristic conchoidal fracture. · Rough uncut specimen with conchoidal fracture
Not applicable (rough, uncut mineral sample) Cut
Carat
Not applicable as this is rough volcanic glass, but specimen weight is roughly estimated in grams rather than carats for gem use.
Color
Opaque black with glossy vitreous luster
Clarity
Not applicable for non-diamond mineral specimens
Shape
Rough uncut specimen with conchoidal fracture
Overall Assessment
The specimen shown in the image is not a diamond, but rather a natural piece of dark volcanic glass exhibiting a classic conchoidal fracture pattern. It holds no gemological or monetary value equivalent to a diamond.
Cut Quality
Not applicable (rough, uncut mineral sample)
Brilliance
Vitreous luster reflecting light from smooth conchoidal surfaces
Fire
None (glass does not disperse light into spectral colors like diamond)
Scintillation
None
Proportions
Not applicable
Symmetry
Asymmetrical natural rough form
Polish
Natural glossy fracture surfaces
Fluorescence
Unknown without UV testing, typically inert for standard obsidian
Inclusions
Possible micro-crystallites or gas bubbles typical of volcanic glass
Blemishes
Natural surface pitting and fracture lines
Origin
Volcanic regions worldwide
Treatment Detection
No treatments detected; natural state
Estimated Value
Nominal value as a mineral specimen or raw lapidary material.
Certification Estimate
Gemological laboratories would identify this as natural volcanic glass (obsidian) rather than grading it as a gemstone diamond.
Investment Potential
Low investment value; collected mainly as a mineral specimen.
Similar Diamonds
None, as this is volcanic glass and not carbon-based diamond.
Setting Suggestions
Wire-wrapping or bezel setting if used in artisan jewelry
Care & Maintenance
Handle with care to avoid chipping the sharp edges of the conchoidal fracture.
Interesting Facts
Obsidian was historically used by ancient civilizations for making sharp cutting tools, arrowheads, and weapons due to its extremely sharp edges when fractured.