Cobalt Lab Green Sapphire, House Of Sylas Long Cushion Cut, 68.355 Carats

SQO173

Regular price$1,800.00
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Gem Note

🤯🤯🤯 The color and cut of this cobalt-doped green lab-grown sapphire are absolutely mind-blowing. This is a truly exceptional stone that will create an incredible piece of jewelry, designed to last a lifetime. The internal reflections enhance the gemstone's color, creating a depth and saturation that is unparalleled in large green lab sapphires.

 

DIMENSIONS AND SHAPE

Size: 26.89mm x 18.5mm x 15.11mm

Weight: 68.355  carats

Cut: House Of Sylas Long Cushion

Shape: Long Cushion

Clarity: Loupe Clean

Inclusions: None

Treatment: None

 

PHYSICAL PROPERTIES

MOHS hardness: 9.0

Pleochroism: Dichroic

Dispersion: 0.018

Density: 4.0

Refractive Index: 1.76

Chemical Formula: Al2O3

POSSIBLE JEWELRY APPLICATIONS

  • Pendant
  • Cocktail Ring
  • Show Off To Friends

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🌍 GENERAL MATERIAL DESCRIPTION

  • Material Name:FF Green
  • Country of Origin : Russia
  • Growth Method: Flame Fusion

This is a truly unique cobalt-doped flame fusion sapphire, believed to be grown in Russia. The crystals stand out for two reasons: they are not split, although some internal strain is noticeable when cutting them, and they are covered with blue cobalt aluminate due to surface oxidation. While this material can produce incredibly vivid green gemstones, it is highly variable, often containing cobalt aluminate internal crystals. We are eager to work with more of this material because, at its best, it can rival the color of djeva78 but on a much larger scale. Moreover, we have yet to encounter any Czochralski green sapphire crystals that match the saturation levels or vividness of this material.

🏭 SPECIFIC Lot INFORMATION

This material is rare on the market due to its high price and low yield. Growing cobalt-doped flame fusion sapphire involves variability, often resulting in cobalt aggregating into cobalt aluminate crystal inclusions.

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Cobalt Lab Green Sapphire, House Of Sylas Long Cushion Cut, 68.355 Carats - DJEVA
Cobalt Lab Green Sapphire, House Of Sylas Long Cushion Cut, 68.355 Carats
Cobalt Lab Green Sapphire, House Of Sylas Long Cushion Cut, 68.355 Carats
Cobalt Lab Green Sapphire, House Of Sylas Long Cushion Cut, 68.355 Carats


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🧠 Gemology Literature

The articles cited here about lab created gemstones are all open source and chronologically sorted for quick and easy access. Each article comes from either the Journal of Gemmology (JofG) or Gems and Gemmology (G&G) archives.