Not a diamond; this is a piece of blue glass showing typical conchoidal fracture and flow lines.
Not a diamond; this is a piece of blue glass showing typical conchoidal fracture and flow lines. · Irregular rough / raw shard
Not applicable (raw, unfaceted glass fragment) Cut
Carat
Estimated equivalent weight around 15-20 carats if measured in gem material
Color
Deep cobalt blue
Clarity
Transparent with visible internal flow lines and bubbles
Shape
Irregular rough / raw shard
Overall Assessment
An interesting blue glass fragment displaying prominent conchoidal fractures, frequently mistaken by novices for a rough sapphire or blue diamond.
Cut Quality
Not applicable (raw, unfaceted glass fragment)
Brilliance
Vitreous luster, low brilliance compared to a diamond
Fire
None, glass lacks the high dispersion of diamond
Scintillation
Minimal, flash effect from smooth fracture planes
Proportions
Non-standard, irregular fragment
Symmetry
Asymmetrical
Polish
Unpolished, natural fracture surfaces
Fluorescence
Unknown without UV testing
Inclusions
Conchoidal fracture ripples and potential gas bubbles typical of manufactured glass
Blemishes
Surface abrasions and chipped edges
Origin
Man-made glass fragment
Treatment Detection
Colored glass (likely cobalt-colored)
Estimated Value
Minimal (nominal value as decorative glass or cullet)
Certification Estimate
Cannot be certified by major diamond grading labs (GIA, AGS, IGI) as it is not diamond or gemstone material
Investment Potential
None as an investment
Similar Diamonds
None, as this is glass rather than diamond
Setting Suggestions
Wire-wrapping if used as a decorative mineral specimen or crafting piece
Care & Maintenance
Standard gentle cleaning with mild soap and water; avoid hard impacts as glass is brittle
Interesting Facts
The curved ripples visible on the surface are known as conchoidal fractures, which are characteristic of amorphous materials like glass