Not a diamond; this is a blue glass or synthetic material displaying conchoidal fractures, inconsistent with diamond crystal structure.
Not a diamond; this is a blue glass or synthetic material displaying conchoidal fractures, inconsistent with diamond crystal structure. · Rough crystal shard / Irregular slab
Not applicable (Raw or crudely fractured piece, unpolished) Cut
Carat
Estimated around 15-25 carats based on visual dimensions (as synthetic glass/material equivalent)
Color
Fancy Deep Blue
Clarity
Included (Contains visible internal stress fractures, bubbles, and flow lines typical of manufactured glass)
Shape
Rough crystal shard / Irregular slab
Overall Assessment
An interesting blue glass specimen with vibrant color and pronounced fracture lines, but lacking any gemological characteristics of a true diamond.
Cut Quality
Not applicable (Raw or crudely fractured piece, unpolished)
Brilliance
Low to moderate, vitreous luster rather than adamantine
Fire
Minimal to none (glass dispersion is much lower than diamond)
Scintillation
Poor due to lack of standard facet alignment and high internal fracture density
Proportions
N/A for raw unworked shard
Symmetry
Poor / Asymmetrical
Polish
Unpolished, rough fracture surfaces
Fluorescence
Unknown without UV testing, likely inert or moderate greenish-blue
Inclusions
Conchoidal fracture patterns, internal stress lines, and potential gas bubbles typical of glass
Blemishes
Rough uneven edges, chipping, and natural fracture marks
Origin
Man-made glass or industrial slag
Treatment Detection
Coloration is likely introduced via metallic oxides during manufacture
Estimated Value
Nominal decorative or craft value (low cost, as it is not a genuine gemstone)
Certification Estimate
Standard gemological laboratories (GIA, IGI) would issue a report identifying this as synthetic glass/slag, not diamond.
Investment Potential
None as an investment asset
Similar Diamonds
None, as this is visually and compositionally distinct from natural or lab-grown diamonds
Setting Suggestions
Wire-wrapping or bezel setting if used for ornamental craft or costume jewelry
Care & Maintenance
Standard cleaning with mild soap and water; avoid impact as glass is brittle and prone to chipping
Interesting Facts
While its striking deep blue hue mimics rare irradiated blue diamonds, the conchoidal fracture lines and lack of adamantine luster quickly reveal its non-gem origin.