Not a diamond; visual characteristics, conchoidal fracture patterns, and optical effects strongly suggest industrial slag glass or quartz crystal
Not a diamond; visual characteristics, conchoidal fracture patterns, and optical effects strongly suggest industrial slag glass or quartz crystal · Raw, unpolished, irregular fragment
Not applicable (Raw/Uncut material) Cut
Carat
Estimated 3.5 to 5.0 carats based on visual volume
Color
Colorless with surface iridescence
Clarity
Included (Contains visible dark inclusions and internal bubbles/fractures typical of glass)
Shape
Raw, unpolished, irregular fragment
Overall Assessment
The specimen shown in the image is not a diamond. Based on the conchoidal fracture patterns, internal bubbles, and surface characteristics, it is most likely a piece of weathered industrial glass or slag. Professional gemological testing (such as a thermal conductivity probe) is recommended to confirm identity.
Cut Quality
Not applicable (Raw/Uncut material)
Brilliance
Low to moderate vitreous luster
Fire
Low dispersion, though surface iridescence creates false spectral flashes
Scintillation
Poor due to lack of standard faceted design
Proportions
Not applicable due to irregular shape
Symmetry
Asymmetrical, irregular fragment
Polish
Raw, unpolished surface with natural or breakage textures
Fluorescence
None observed
Inclusions
Dark particulate inclusions and stress fractures
Blemishes
Surface chips, weathering, and abrasion marks
Origin
Terrestrial, likely man-made industrial byproduct (slag glass) or common natural quartz
Treatment Detection
None detected; standard untreated material
Estimated Value
Minimal to negligible monetary value as a gemstone
Certification Estimate
N/A (Gemological laboratories like GIA or IGI would not issue diamond grading reports for non-diamond glass/quartz)
Investment Potential
None
Similar Diamonds
None, as this specimen is not a diamond
Setting Suggestions
Not recommended for fine jewelry due to softness and fragility
Care & Maintenance
Handle with care to avoid chipping if composed of glass; store separately from genuine gemstones
Interesting Facts
Many rough glass fragments found outdoors are frequently mistaken for raw diamonds or quartz due to their glassy luster and transparent appearance