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Untreated Iridescence Chrome Tourmaline 18.89 (RCT1889)

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18.89 Carat (sold)
Rainbow in forrest
Medium Dark 70
Translucent

Details:

  

GRADING REPORT RCT1889:

 

- Identification: Natural Unheated & Untreated Chrome Tourmaline

- Carat: 18.89

- Shape: Oval Cabochon

- Measures: 19.93x14.75x7.81 (millimeter)

- Color Grade: n.a.

- Tone: MD70

- Color Zoning: n.a.

- Clarity: Translucent

- Cutting Grade: Good

o       Brilliancy: n.a.

o       Depth: 53%

- Origin: Mozambique

- Treatment: Treatment

 

Certificate No: 17208245 (see more images)

 

Overall Grade: Excellent

Comment: Here is a true rarity: Iridescence in a chrome tourmaline (GIA certified), sparkling with the color of the rainbow like opal. (probably a result of silica or liquid captured in the gem). Red, blue, green, yellow and gold come and go as the gem is turned. Mineral collector item and a beauty for a most unique pendant. We (not GIA)  have never seen this in chrome tourmaline before. It is sometimes found (and extra highly priced) in copper tourmaline.

 

 

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