Welcome To Ashstone Exports LTD

  • Nigeria

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Welcome to Ashstone Exports LTD

At Ashstone Exports Ltd, we are committed to sustainability, ethical sourcing, and long-term growth. We exist to unlock Nigeria’s economic potential and deliver value to partners across continents. Our story is one of quality, integrity, and ambition—driven by a belief that Africa’s resources can fuel global industries.

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  • House 2 Amasom 18 Bishop Edward Benson street Ogudu GRA phase 2

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Sapphire

Ashstone Exports Ltd

Sapphire

Property Specification
Chemical Formula Al₂O₃ (Aluminum Oxide)
Crystal System Trigonal (Hexagonal)
Hardness (Mohs) 9
Specific Gravity 3.95 – 4.03
Cleavage None (parting may occur)
Fracture Conchoidal to uneven
Luster Vitreous
Transparency Transparent to opaque
Refractive Index 1.762 – 1.770
Color Typically blue; also pink, yellow, green, orange, purple, and colorless
Streak White
Tenacity Brittle
Crystal Habit Tabular, prismatic, or bipyramidal crystals
Pleochroism Strong in colored varieties (especially blue sapphires)
Birefringence 0.008 – 0.010