Non-Diamond (Likely Slag Glass or Cobalt Glass)
Non-Diamond (Likely Slag Glass or Cobalt Glass) · Rough / Uncut (Amorphous Shard)
None (Rough/Broken) Cut
Carat
Estimated 5.0 - 15.0 carats based on visual volume
Color
Fancy Deep Blue (Cobalt saturation)
Clarity
Translucent to Opaque (Equivalent to I-category)
Shape
Rough / Uncut (Amorphous Shard)
Overall Assessment
This specimen is not a diamond. It lacks the cubic crystal structure, adamantine luster, and refractive properties of a diamond. The conchoidal (shell-like) fractures and presence of surface pitting indicate it is likely a piece of weathered industrial glass or slag.
Cut Quality
None (Rough/Broken)
Brilliance
Low (Typical of non-crystalline glass)
Fire
None
Scintillation
Low (Limited surface reflection only)
Proportions
Invalid (N/A for rough shards)
Symmetry
Poor (Irregular)
Polish
Poor (Naturally weathered or fractured)
Fluorescence
None expected for glass
Inclusions
Visible gas bubbles, swirl marks, and flow lines characteristic of glass
Blemishes
Conchoidal fractures, pitting, and surface abrasion
Origin
Likely anthropogenic (industrial byproduct/man-made glass)
Treatment Detection
Cobalt doping (indicated by intense blue color)
Estimated Value
$1 - $10 (Decorative value only)
Certification Estimate
Unlikely to be accepted by GIA/AGS as a diamond; would be identified as glass by any local gemologist
Investment Potential
None (Decorative or curiosity value only)
Similar Diamonds
None; does not resemble natural blue diamonds which exhibit different crystal systems and luster
Setting Suggestions
Wire wrap or simple bezel for decorative purposes only
Care & Maintenance
Avoid high heat; glass is prone to chipping and thermal shock
Interesting Facts
The deep blue color and conchoidal fracture pattern are classic indicators of cobalt glass, often mistaken for blue sapphire or blue diamond by amateur collectors.