Not a diamond; appears to be a piece of cobalt blue sea glass or man-made colored glass.
Not a diamond; appears to be a piece of cobalt blue sea glass or man-made colored glass. · Irregular / Raw fragment
Not applicable (raw, weathered fragment) Cut
Carat
Not applicable (not a gemstone)
Color
Deep Cobalt Blue (Fancy Dark Blue if evaluated as colored stone)
Clarity
Not applicable to glass, but shows typical internal bubbles/flow lines
Shape
Irregular / Raw fragment
Overall Assessment
This object is definitively not a diamond or gemstone. Visual examination reveals the conchoidal fractures, internal bubbles, and surface wear characteristic of a piece of cobalt blue sea glass.
Cut Quality
Not applicable (raw, weathered fragment)
Brilliance
Low to moderate vitreous luster
Fire
None
Scintillation
Minimal, limited to surface light reflection
Proportions
Irregular chunk with no standard facet proportions
Symmetry
Asymmetrical, naturally tumbled or broken
Polish
Matte to slightly worn, weathered surface characteristic of sea glass
Fluorescence
Unknown / Not tested under UV light
Inclusions
Internal gas bubbles and flow lines typical of manufactured glass
Blemishes
Surface abrasions, chips, and frosted texture from wave action
Origin
Man-made glass container or bottle fragment
Treatment Detection
Colored via metallic oxides (cobalt) during manufacturing
Estimated Value
Nominal (decorative or craft value only, typically under $5)
Certification Estimate
None (gemological laboratories do not grade glass fragments)
Investment Potential
None as an investment
Similar Diamonds
None (this is glass, not a diamond or diamond simulants like CZ or moissanite)
Setting Suggestions
Wire-wrapping or bezel setting for casual artisan jewelry
Care & Maintenance
Wash gently with mild soap and warm water; avoid harsh chemicals
Interesting Facts
Cobalt blue glass was commonly used for historical medicine bottles, poison bottles, and decorative glassware in the 19th and 20th centuries.