Not a diamond; this is a rough blue synthetic or industrial glass/slag fragment, possibly used for decorative or experimental lapidary work.
Not a diamond; this is a rough blue synthetic or industrial glass/slag fragment, possibly used for decorative or experimental lapidary work. · Uncut rough / Irregular fragment
Not applicable (Rough, unpolished raw material) Cut
Carat
Estimated 15 - 25 carats equivalent based on visual volume
Color
Deep Fancy Vivid Blue
Clarity
Included (Contains internal bubbles and flow lines typical of glass)
Shape
Uncut rough / Irregular fragment
Overall Assessment
An interesting raw, vibrantly colored vitreous fragment that mimics the color of high-end sapphires or irradiated diamonds, but lacks the hardness, crystal structure, and optical properties of true gemstones.
Cut Quality
Not applicable (Rough, unpolished raw material)
Brilliance
Vitreous luster, low white light return due to lack of standard facet geometry
Fire
Minimal dispersion compared to diamond or high-RI gemstones
Scintillation
Poor, lacking facet-driven light play
Proportions
Elongated irregular bar shape with uneven thickness
Symmetry
Asymmetrical / Irregular
Polish
Raw / Unpolished fracture surfaces
Fluorescence
Strong blue under UV light (typical for certain colorants in glass)
Inclusions
Gas bubbles and swirling internal striae characteristic of glass manufacturing
Blemishes
Surface conchoidal fractures, chips, and rough edges
Origin
Man-made / Industrial or decorative glass production
Treatment Detection
Not applicable; purely synthetic vitreous material
Estimated Value
Nominal / Low value (decorative or craft material)
Certification Estimate
Cannot be certified as a gemstone by major labs (GIA, AGS, IGI); would be identified as man-made glass.
Investment Potential
None as an investment; possesses purely aesthetic or educational value.
Similar Diamonds
None, as this material has entirely different physical and optical properties from diamond.
Setting Suggestions
Wire-wrapping or bespoke artisan bezel setting if used as a mineral specimen or craft piece
Care & Maintenance
Store separately to avoid scratching softer materials, clean with mild soap and warm water.
Interesting Facts
Vibrant cobalt-like coloration is often achieved in glass through the addition of metallic oxides during the melting process.