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LOOSE GREEN TOURMALINE      NATURAL COLOR       Hardness 7.5 
Online Certificate
RETURN TO TOURMALINE GREEN
Tourmaline chemical composition is (Na, Li,Ca) (Fe2, Mg, Mn, Al)3 Al6 I(OH)4 I (BO3)3ISi6O18I .
Crystaline system: Trigonal.
Occurences: In the acid magmatic rocks and associated pegmatites, limestones and schists, placers.
Coloured tourmalines are related to sodolithic pegmatites.
One distinguishes two principal types of tourmalines: the hexagonal type and the triangular one.
  15.00 cts. Emerald cut tourmaline single
15 carats green tourmaline gemstone, exclusive loose faceted tourmalines, Madagascar gemstones shopping   x Pieces: 1 Tourmaline x x Type: 100% Natural
 
  Color: Green   Shape: Octagon
                 
  Weight: 15.00 Carats   Size: 16 x 12  mm
 
  Clarity: Slightly included.   Luster: Excellent
 
  Treatment: None (N)   Origin: Madagascar
Tone scale: medium. This stone has an    Refr. Index: 1.62-1.64   Hardness 7.5
obviously Green color under daylight the 
coloration is y G and under incandescent light,  Depth:9.1 mm.
the coloration is G.
 

Stone Price: USD 2850.00

ref:Tge 1500 

 

 

   Octagon green tourmaline gemstone, exclusive loose faceted tourmalines, Madagascar gemstones shopping

 green tourmaline gemstone, exclusive loose faceted tourmalines, Madagascar gemstones shopping

   
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This is a virtual certificate compiled from the lab data for the gemstone being examined. Clarity is based on magnification
under a 10X corrected loupe. All gemology performed by GGGems. Jean & Alain Darbellay guaranteeing that this stone  
                        is 100% natural. Prices and availability are subject to change without notice.
 
    
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Tourmaline Discovery
Hardness: 7 - 7.5
Specific Gravity: 3.0+  Visual Catalog
Refractive Index: 1.62 - 1.68   Cutting Styles
Chemical Composition: Na(Li,Al)3Al6Si6O18(BO3)3 (OH)4, Sodium Lithium Aluminum Boro-Silicate Hydroxide Tourmaline data
Crystal Structure: Trigonal   Ask a question
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- Scale determining the purity of a stone.  -
FL NFL SI1 SI2 MI1
Flaw less Near flaw less Slightly included 1 Slightly included 2 Medium included 1
-------------------------------------------------------------------------------------------------------------------------------------------------------------------
MI2 MI3 VI1 VI2 HI
Medium included 2 Medium included 3 Very included 1 Very included 2 Highly included
 
 
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