Loose gemstone

Corundum - Sapphire

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Details

Carat: 1.57 ct
Dimensions: 6.2 x 5.4 x 4.5 mm
Cut: Emerald cut
Shape: Octagon
Cutting style: Step cut
Colour: Dusty Blue
Clarity: Slightly included
Treatment: Untreated
Origin: Tanzania
Stone number: 7778

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· Mineralogy ·

blue Sapphire

The blue sapphire is considered the epitome of noble beauty. Its color palette ranges from delicate cornflower blue to deep royal blue. It radiates dignity, constancy, and timeless elegance.

Mohs hardness

trigonal

Crystal system

1.762 - 1.770

Refractive index

Untreated

Natural stone

Properties

Mineral group: Corundum
Chemical formula: Al₂O₃
Colorant: iron and titanium
Crystal system: trigonal
Hardness (Mohs): 9
Density: approx. 4.0 g/cm³
Refractive index: 1.762 - 1.770
Optical character: anisotropic, uniaxial negative
Birefringence: 0.008 - 0.010
Dispersion: 0.018
Pleochroism: distinctly dichroic: violetish blue / greenish blue
Fluorescence: usually inert (iron content quenches)
Luster: vitreous

Why this stone

As one of the most sought-after gemstones, it embodies royal elegance, extraordinary brilliance, and symbolic strength - ideal for luxurious jewelry designs.