11.6 cts 15x11x8mm Loose faceted Imperial Topaz cut oval s671

Product Details

  • 11.6 cts 15x11x8mm Loose faceted Imperial Topaz cut oval s671
  • s671
  • Topaz
  • $2,200.00 inc. tax

  • Units in Stock: 1

11.6 cts 15x11x8mm Loose faceted Imperial Topaz cut oval s671 Summary

Imperial  Topaz loose faceted cut oval 11.6 cts  15x11x8mm s671
 
 
 Certified
100% real not man made but genuine from the earth gemstone.
100% Genuine and natural no treatment.
100% money back if not happy.  
 

CLARITY SCALE
IF VERY HIGH QUALITY & FREE FROM INCLUSIONS.

THIS GEMSTONE IS GRADED: I F

 

Topaz (aluminum fluor-silicate)

Color: Blue, colorless, pink, orange, red, champagne, sherry-brown, brown and yellow.

Names/Colors:

Sky Blue - Light blue

Swiss Blue - Medium blue

London Blue - Dark blue, generally with steely undertone.

Imperial - Orange, pink and red.

Mohs hardness: 8

Refractive index: 1.61-1.638

Critical angle: 38°

Specific gravity: 3.53-3.56

Cleavage: Very perfect in one direction.

Fracture: Conchoidal, uneven.

Dispersion: Medium (.014)

Heat sensitivity: None

Pleochroism: Dichroic – Blue: weak (light-blue to pinkish or colorless); Brown: definite (stronger yellowish cast); Green: definite (Pale-green to paler or colorless); Pink: definite (pink to pale pink or colorless); Red: strong (deep red to pinkish red); Yellow: definite (lighter to deeper yellow).

Birefringence (double refraction): Weak (.008-.01)

Crystal structure: Orthorhombic

Treatments: Blues are irradiated and heated.

Cutting: Orient the stone 7 to 10 degrees away from the cleavage plane.

Polishing: Alumina on most common polishing laps or 50,000 diamond on tin/lead or ceramic lap.

 

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