Natural rough mineral crystal, appearing to be quartz or glass rather than gemstone quality diamond due to matrix inclusions and structural markings
Natural rough mineral crystal, appearing to be quartz or glass rather than gemstone quality diamond due to matrix inclusions and structural markings · Rough crystal fragment with an engraved hallmark or square stamp symbol on the surface
Uncut / Rough specimen Cut
Carat
Estimated roughly 15-20 carats based on visible scale and thickness
Color
Light brownish-yellow (cape series or tinted)
Clarity
Included (I3 equivalent with visible fractures and surface imperfections)
Shape
Rough crystal fragment with an engraved hallmark or square stamp symbol on the surface
Overall Assessment
The specimen shown in the image is a rough, unrefined crystal fragment displaying a stamped hallmark symbol, likely quartz, glass, or industrial slag rather than a genuine diamond. It holds curiosity value due to the engraved marking but has no gem-grade diamond characteristics.
Cut Quality
Uncut / Rough specimen
Brilliance
Low, due to lack of standard facet angles and transparency issues
Fire
Minimal dispersion due to material properties and surface condition
Scintillation
Poor, lacking standard pavilion and crown facets
Proportions
Irregular raw specimen with no standard faceting proportions
Symmetry
Natural asymmetrical crystal growth
Polish
Unpolished natural cleavage planes with flat cut or stamped facet edges
Fluorescence
Unable to determine without UV testing (likely none to faint)
Inclusions
Internal feather fractures, trapped minerals, and structural inclusions
Blemishes
Surface abrasions, natural growth lines, and an engraved square hallmark symbol
Origin
Terrestrial mineral formation with human-made stamping or engraving
Treatment Detection
Engraved hallmark indicates human modification; no obvious gemological enhancements detected
Estimated Value
Nominal value as a mineral specimen or artifact, not valued as a commercial diamond
Certification Estimate
Not applicable for grading diamond certificates; would require mineralogical testing (GIA or local gemological lab for identification)
Investment Potential
Very low as an investment, primarily of curios or mineral collection interest
Similar Diamonds
None, as this appears to be a quartz or glass aggregate rather than a diamond
Setting Suggestions
Display specimen in a custom mineral mount or wire-wrap pendant
Care & Maintenance
Store in a dry environment and handle carefully to prevent chipping along cleavage planes
Interesting Facts
The presence of a stamped square hallmark suggests this raw or semi-processed crystal served a specific industrial, trade, or symbolic purpose