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Black sapphire round black sapphire square black sapphire oval black sapphire pear black sapphire marquise black sapphire octagon black star sapphire black sapphire cushion

Black sapphire

Chemical Formula Al2O3

Black Sapphire comes from the corundum family. It gets its black because of the presense of various elements. Black sapphires naturally occur in nature.

We carry black sapphires in calibrated sizes in several shapes such as rounds, ovals, marquise, baguettes, etc in various sizes. For more information on the sizes we usually keep in calibrated sizes, please click here.

We can also cut precision cut black sapphires, this is finely cut and crafted to bring the maximum brilliancy into it. This is done with the help of automated machines and skilled labour. For your demands in precision cut, please contact us for more information.

We can accomodate pairs, layouts and single unique black sapphires. Also perfected is the art of special cuts or custom cuts. This is suited to fit your specifications and can be any shape and/or cut of your choice. For your requirements, please contact us.

Crystal Habit Massive and Granular
Crystal System Hexagonal
Cleavage None
Fracture Conchoidal, Splintery
Hardness (Mohs Scale) 9.0
Luster Vitreous
Refractive Index 1.762-1.778
Optical properties Abbe number 72.2
Birefringence 0.008
Pleochroism Strong
Streak White
Specific Gravity 3.95-4.03
Melting point 2030-2050 C
Fusibility Infusible
Solubility Insoluble
Coefficient of thermal Expansion 5e-6-6.6e-6/K

 

Black sapphire - Calibrated Sizes

We make the following calibrated sizes and can even make other in-between sizes as well. For rounds, we can cut step cut and brilliant cut (diamond cut). For squares, we can cut step cut and princess cut and and special cuts such as french cut as well.

Oval
3x2
4x3
5x3
5x4
6x4
6x5
7x5
8x6
9x7
10x8
& bigger
Pear
3x2
4x3
5x3
5x4
6x4
6x5
7x5
8x6
9x7
10x8
& bigger
Round
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
& bigger
Square
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
& bigger
Marquise
3x1.5
4x2
5x2.5
6x3
7x3.5
8x4
9x4.5
10x5
12x6
14x7
& bigger
Baguette
3x1.5
4x2
5x2.5
6x3
7x3.5
8x4
9x4.5
10x5
12x6
14x7
& bigger
Octagon
4x3
5x3
5x4
6x4
6x5
7x5
8x6
9x7
10x8
& bigger
Heart
3.0
3.5
4.0
4.5
5.0
5.5
& bigger
Trillion
3.0
3.5
4.0
4.5
5.0
5.5
& bigger
Drop / Briollet
4x3
5x3
5x4
6x4
6x5
7x5
8x6
9x7
10x8
& bigger

 

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