Not a diamond; this specimen is a rough piece of blue glass or synthetic cobalt-doped material, displaying conchoidal fracture and internal gas bubbles characteristic of glass rather than any natural gemstone or diamond.
Not a diamond; this specimen is a rough piece of blue glass or synthetic cobalt-doped material, displaying conchoidal fracture and internal gas bubbles characteristic of glass rather than any natural gemstone or diamond. · Rough, irregular, un-faceted raw nugget or cullet.
Not applicable (Rough, unworked material). Cut
Carat
Estimated around 5 to 8 carats based on visual proportions.
Color
Vivid deep blue (Fancy Dark Blue equivalent if graded, though colored by artificial or glass matrix rather than crystal lattice impurities).
Clarity
Included (Contains visible gas bubbles and flow lines typical of manufactured glass).
Shape
Rough, irregular, un-faceted raw nugget or cullet.
Overall Assessment
The specimen shown in the image is not a diamond or a natural gemstone, but rather a fragment of vibrant blue glass exhibiting classic conchoidal fracture and internal gas bubbles.
Cut Quality
Not applicable (Rough, unworked material).
Brilliance
Vitreous luster with limited internal light return due to lack of precision faceting.
Fire
Very low dispersion compared to diamond or high-index synthetics.
Scintillation
Minimal play of light, restricted to surface reflections off conchoidal faces.
Proportions
Non-standard, completely organic or fractured rough mass with no defined table, crown, or pavilion angles.
Symmetry
Asymmetrical due to random fracture and melting/cooling process.
Polish
Raw, unpolished surface with natural fracture textures and conchoidal ripples.
Fluorescence
Inert to moderate depending on UV wavelength, typical of cobalt glass formulations.
Inclusions
Spherical gas bubbles, swirling internal striations, and localized tension fractures.
Blemishes
Surface abrasions, chips along sharp fracture edges, and minor pitting.
Origin
Man-made industrial cullet or decorative slag glass.
Treatment Detection
Completely synthetic origin evidenced by gas bubbles and isotropic properties.
Estimated Value
Nominal or decorative value only (typically under $5 USD as a curiosity or slag glass specimen).
Certification Estimate
Not certifiable as a gemstone by major gemological laboratories (GIA, AGS, IGI) as it is manufactured glass.
Investment Potential
Zero investment value; collector of slag glass or mineral curiosities only.
Similar Diamonds
None; this does not resemble a diamond in optical or physical properties.
Setting Suggestions
Wire-wrapped pendant or rustic bezel setting if used for costume jewelry.
Care & Maintenance
Standard cleaning with warm soapy water and a soft brush; avoid harsh acids or thermal shock.
Interesting Facts
Cobalt-infused glass is often mistaken by novices for rough sapphire, tanzanite, or blue diamond due to its intense saturation.