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Ceylon Cobalt Spinel 3.37 Carat

Cobalt blue Ceylon cobalt spinel precisionc cut
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3.37 Carat
Cobalt Blue
Medium Dark 70
Very Lightly Included



  • Identification: Natural Unheated & Untreated Spinel
  • Carat: 3.37
  • Shape: Cushion
  • Measures: 10.11x8.45x5.48 (millimeter)
  • Color Grade: Excellent
  • Tone: MD70
  • Color Zoning: None
  • Clarity: Very Lightly Included
  • Cutting Grade: Excellent (precision cut by Peter T.)
    • Brilliancy: 85%
    • Depth: 65%
  • Origin: Sri Lanka
  • Treatment: None

Certificate No: GF14031452 & 10121719771 (pre re-cut at 5.59 carat) 

Overall Grade: Excellent+

Comment: Cobalt spinel is one of the rarest gems in the world (it is blue spinel in which the color is caused by a certain content of cobalt). This totally perfect 3.37 carat was recut by Peter T. from a 5.5 stone (see old cert). It has virtually no inclusions (hard to find under the lens), a huge face with no window, magic color that is found only in this type of spinel. Though the uninitiated might be tempted to compare it with fine sapphire, it does have its own character. For fun, compare the dimensions in the old certificate with the new dimensions, mark the weight loss, while the visual size of the stone (face) is only 1mm reduced and yet the window is gone: master cut.

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