Gemstone Shop
Ask a Q
My Account
Ed Bristol
Ceylon Cobalt Spinel
Tanzanian Ruby
more images
back add to cart buy now

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.

Ask a question.

Note to self or cart:
back add to cart buy now add to wishlist

Thanksgiving Sales:

The world's very best gemstones at 66% of their regular price!

Untreated, clean, top colours, precision cuts, fully certified, free home delivery plus 1000sqm of rainforest for your grandkids.

Two (2) vouchers cutting 33% off THE BEST:

Use this voucher: "33ThanksGiving15" at the end of check-out.

Totally limited availability. Until first of December only.


Natural Gemstones Only!

No Heat, No Radiation.
No Bleaching, No Coating.
No Filler, No Diffusion.
No BE, No Chemicals.

Nothing but... gems!

Made by Earth.


Wherever you are:

Workshop Window: (mouse-over->halt) 

Click 'YouTube' in lower right corner
to listen while window shopping.

Join the Club 

 Wild Fish Members
save up to 25%

Apply here!

US and CAN Call Toll-Free:


International Please Call:


 Show Other Currency: 

Site Mailing List 
Natural Gems Only - No Heat. No Radiation. No Bleaching. No Coating. No Filler. No Diffusion. No Chemicals.


Genuine testimonials since 2003

Call us TOLL-FREE from the US and Canada:
International customers please call:

In case of technical problems,
drop us a note or let us call back.

In case we are out of the office, please leave a voice message and we will contact you.

Our Sitemap
 © Wild Fish Gems 2001 - 2015