Not a diamond (appears to be a piece of colored glass or synthetic gemstone rough)
Not a diamond (appears to be a piece of colored glass or synthetic gemstone rough) · Raw, uncut, amorphous crystalline fragment
N/A (Rough, unpolished material) Cut
Carat
Estimated at approximately 15-25 carats based on visual proportions
Color
Vivid Fancy Cyan / Deep Blue
Clarity
Included (Contains visible internal fractures, gas bubbles, and flow lines characteristic of glass)
Shape
Raw, uncut, amorphous crystalline fragment
Overall Assessment
The specimen shown in the image is definitively not a diamond. Based on the conchoidal fracture patterns, internal swirl marks, and vibrant cyan coloration, it is a piece of man-made decorative glass or mineral slag. It possesses zero diamond characteristics and should be evaluated strictly as a decorative or craft specimen.
Cut Quality
N/A (Rough, unpolished material)
Brilliance
Vitreous to sub-adamantine luster, limited light return due to lack of precision faceting
Fire
Low dispersion (distinctly non-diamond optical properties)
Scintillation
Minimal blocky flash patterns, lacking the sharp contrast of a properly cut gemstone
Proportions
Irregular raw crystal fragment; no standard table or depth measurements apply
Symmetry
N/A (Natural/irregular fragment)
Polish
N/A (Unpolished surface with conchoidal fracture patterns)
Fluorescence
Inert to strong chalky blue depending on UV source
Inclusions
Conchoidal fracture lines, swirl marks, and trapped gas bubbles typical of manufactured glass
Blemishes
Surface scratches, chips, and uneven texture resulting from breakage
Origin
Laboratory / Industrial manufactured glass or slag glass
Treatment Detection
No gemstone treatments detected as the material itself is non-gem quality glass
Estimated Value
Nominal decorative or collector value (under $20 USD)
Certification Estimate
Standard gemological laboratories (GIA, IGI) would issue a report identifying this as manufactured glass or composite material rather than a genuine diamond
Investment Potential
None; this specimen holds no financial investment or resale value
Similar Diamonds
None, as this material has no diamond-like properties beyond superficial blue coloration
Setting Suggestions
Wire-wrapping or bespoke bezel setting if used for ornamental artisanal jewelry
Care & Maintenance
Avoid harsh impacts, ultrasonic cleaners, and extreme temperature changes to prevent shattering
Interesting Facts
Bright blue slag glass is frequently mistaken for rough aquamarine or blue diamond crystals by untrained observers due to its striking vitreous luster