Not a diamond; this is a rough blue sapphire (corundum), displaying a natural deep blue color and crystalline rough structure.
Not a diamond; this is a rough blue sapphire (corundum), displaying a natural deep blue color and crystalline rough structure. · Rough crystal / Uncut crystal formation with natural irregularities.
Not applicable (Rough, unpolished stone). Cut
Carat
Estimated between 2.5 to 4.0 carats based on visual proportions relative to human fingers.
Color
Deep Royal Blue / Fancy Dark Blue gemstone grade.
Clarity
Included (I1/I2) due to natural internal feathering, cloudiness, and crystal growth lines typical of rough corundum.
Shape
Rough crystal / Uncut crystal formation with natural irregularities.
Overall Assessment
A promising piece of rough blue sapphire offering good potential for a skilled lapidary to facet a vibrant, deep blue gemstone once properly assessed and cut.
Cut Quality
Not applicable (Rough, unpolished stone).
Brilliance
Limited in current rough state; concentrated mostly in localized translucent windows.
Fire
Very low dispersion typical of corundum compared to diamond.
Scintillation
Minimal sparkle in raw form; will improve dramatically upon professional cutting and faceting.
Proportions
Irregular raw crystal geometry; depth and table percentages do not apply.
Symmetry
Asymmetrical, natural rough crystal form showing hexagonal prismatic tendencies.
Polish
Unpolished, raw natural crystal faces and fracture surfaces.
Fluorescence
Typically inert to faint red under long-wave UV, depending on exact chromium-iron trace elements.
Inclusions
Typical natural sapphire inclusions including rutile silk needles, mineral crystals, and internal fracture planes.
Blemishes
Natural surface etching, rough skin, and growth steps.
Origin
Likely of alluvial or primary metamorphic origin from regions such as Sri Lanka, Madagascar, or East Africa.
Treatment Detection
Requires advanced gemological testing (FTIR, microscopic analysis) to determine if unheated or heat-treated for color improvement.
Estimated Value
Rough market value estimated between $150 to $500 depending on final cut yield and origin.
Certification Estimate
GIA or SSEF, certifying natural blue sapphire with an evaluation of thermal treatment status.
Investment Potential
Moderate to high if certified as unheated (no heat) with fine royal blue color and good clarity recovery after cutting.
Similar Diamonds
Not applicable as this is a colored gemstone (sapphire), not a diamond.
Setting Suggestions
Once cut into a cushion or oval shape, best set in yellow or white gold surrounded by diamond accent stones to contrast the rich blue.
Care & Maintenance
Safe for ultrasonic and steam cleaning if untreated; avoid harsh acids and protect from hard impacts.
Interesting Facts
Corundum is the second hardest natural mineral on earth (Mohs hardness of 9), making sapphire exceptionally durable for daily jewelry wear.