Not a diamond; this is a rough sapphire or synthetic blue corundum specimen.
Not a diamond; this is a rough sapphire or synthetic blue corundum specimen. · Rough elongated crystal bar / slab
Not applicable (rough uncut mineral specimen) Cut
Carat
Estimated 10-15 carats (rough equivalent)
Color
Deep Vivid Blue (Fancy Dark Blue)
Clarity
Included / Translucent (VS to SI range if faceted due to internal clouds and fractures)
Shape
Rough elongated crystal bar / slab
Overall Assessment
An interesting deep blue rough corundum specimen, highly saturated in color, suitable for wire-wrapping or study rather than traditional faceting without further testing.
Cut Quality
Not applicable (rough uncut mineral specimen)
Brilliance
Low due to rough, unpolished surface and deep saturation
Fire
Minimal dispersion, typical of corundum
Scintillation
Poor due to lack of facet geometry
Proportions
Elongated rectangular bar proportions
Symmetry
Natural crystal symmetry, elongated prismatic habit
Polish
Raw crystal faces with rough sawed or fractured ends
Fluorescence
Inert to moderate chalky depending on UV source
Inclusions
Internal cloudiness, silk, and natural fractures visible
Blemishes
Surface irregularities, natural growth lines, and rough edges
Origin
Likely metamorphic or igneous origin; possible synthetic flame-fusion boule slice
Treatment Detection
Needs microscopic and spectroscopic analysis to rule out heat treatment or lattice diffusion
Estimated Value
Depends on natural vs synthetic origin, roughly $50 - $300 as a mineral specimen
Certification Estimate
GIA or Gübelin (if gemstone quality report needed for corundum)
Investment Potential
Low as a raw cutting rough unless verified as unheated fine-origin natural sapphire
Similar Diamonds
None, as this is corundum (sapphire) rather than diamond
Setting Suggestions
Wire-wrapped pendant or custom bezel setting to showcase raw mineral form
Care & Maintenance
Store separately to avoid scratching softer stones; clean with warm soapy water and soft brush
Interesting Facts
Corundum has a Mohs hardness of 9, second only to diamond, making it extremely durable