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Untreated Brazilian Blue Topaz 3.71 (CBT371)

cushion cut extra brilliant topaz from Brazil, unheated and natural, no window, no inclusions but bl
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3.71 Carat
Arctic Blue
Light 33
Very Lightly Included



- Identification: Natural Unheated & Untreated Blue Topaz
- Carat: 3.71
- Shape: Cushion
- Measures: 10.92x6.97x5.68 (millimeter)
- Color Grade: Very Good 
- Tone: Light 33
- Color Zoning: None
- Clarity: Lightly Included
- Cutting Grade: Very Good
  > Brilliancy: 99%
  > Depth: 52% (lengthwise), 81%
- Origin: Brazil
Treatment: None

Certificate No: IGI 371988869 (see 'more images')

Overall Grade: Very Good

Comment: From the same mine as 17.06 but with a dash of blue, not green, both certified by IGI as such. All untreated blue in topaz is delicate on photo. Miracles of untreated Swiss- or London-blue topaz are excluded from competition until a scientific method of testing has been found. We own a good collection of blue topaz sold as 'untreated' rough but they remain in our safe as they turned out to be too good to be true after cutting, to vivid, to shiny blue for the critical buyer and without a legitimate testing method we have no way of assuring you of their untreated natural state. We cannot present them here under our 3*Nos policy (ask if you don't care about scientific proof). In this gem, the green, which utterly dominates the 17-carats gem, shows only as a secondary hue, more on photo than in person, as so often in light toned hues. Its brilliancy, the maximal possible light reflection, comes close to a perfect hundred percent, a blast of light from 11x7mm with glittering sparks of blue. A gemologically rare gem and an impeccable beauty with the "3*Nos of Excellence": no treatment, no window, no inclusions. As for the latter, inclusions, we shot close-ups of the thinner-than-the-eye-can-see, parallel needles that make a study under the lens a rewarding exercise, such delicate matter, impossible to imagine OUTSIDE a gem. As always, in light hues, the skin color in the handshot below overshadows the delicate body color. See side-images and other shots to get a better idea on the type of blue, an arctic blue from the inaccessible depths of a giant iceberg.


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