GIA's Gübelin Gem Project: Tourmaline


Colour-zoned tourmaline
Tourmalines
Photo by Robert Weldon/GIA, courtesy Dr E. J. Gübelin Collection
GIA Collection 33673, 34233, 34234, 34237, 34239

Tourmalines have a very complex chemical composition, and more than a dozen mineral species are recognised within this group. Their highly variable chemical composition gives rise to a wide range of colours. Among the many varieties of elbaite tourmaline are verdelite (green), indicolite (blue) and rubellite (red). Some tourmaline specimens display multiple colours. Optical effects include pleochroism (a change of colour when the gemstone is rotated) and chatoyancy (a “cat’s-eye” seen in reflected light).

 
35039
13.31 ct. Tourmaline - Dravite from Kenya

13.31 ct tourmaline (dravite)
Kenya (PDF)

 
34461


4.17 ct tourmaline (dravite)
Mexico (PDF)

 
33635
31.21 ct Tourmaline - Dravite from Mozambique

31.21 ct tourmaline (dravite)
Mozambique (PDF)

 
34666


3.24 ct tourmaline (dravite)
Myanmar (PDF)

 
35064


10.36 ct tourmaline (dravite)
Tanzania (PDF)

 
33648
12.33 ct Tourmaline - Elbaite from Afghanistan

12.33 ct tourmaline (elbaite)
Afghanistan (PDF)

 
33604
4.52 ct Tourmaline - Elbaite from Brazil

4.52 ct tourmaline (elbaite)
Brazil (PDF)

 
33617
7.23 ct Tourmaline - Elbaite from Brazil

7.23 ct tourmaline (elbaite)
Brazil (PDF)

 
33606
8.01 ct Tourmaline - Elbaite from Brazil

8.01 ct tourmaline (elbaite)
Brazil (PDF)

 
34310
13.27 ct Tourmaline - Elbaite from Brazil

13.27 ct tourmaline (elbaite)
Brazil (PDF)

 
34309
16.87 ct Tourmaline - Elbaite from Brazil

16.87 ct tourmaline (elbaite)
Brazil (PDF)

 
34311
20.15 ct Tourmaline - Elbaite from Brazil

20.15 ct tourmaline (elbaite)
Brazil (PDF)

 
34379
3.36 ct Tourmaline - Elbaite from Kenya

3.36 ct tourmaline (elbaite)
Kenya (PDF)

 
33624
3.68 ct Tourmaline - Elbaite from Kenya

3.68 ct tourmaline (elbaite)
Kenya (PDF)

 
33683
6.53 ct Tourmaline - Elbaite from Madagascar

6.53 ct tourmaline (elbaite)
Madagascar (PDF)

 
34507
7.13 ct Tourmaline - Elbaite from Mozambique

7.13 ct tourmaline (elbaite)
Mozambique (PDF)

 
34531
7.50 ct Tourmaline - Elbaite from Mozambique

7.50 ct tourmaline (elbaite)
Mozambique (PDF)

 
33612
8.05 ct Tourmaline - Elbaite from Mozambique

8.05 ct tourmaline (elbaite)
Mozambique (PDF)

 
34524
12.87 ct Tourmaline - Elbaite from Mozambique

12.87 ct tourmaline (elbaite)
Mozambique (PDF)

 
34526
16.08 ct Tourmaline - Elbaite from Mozambique

16.08 ct tourmaline (elbaite)
Mozambique (PDF)

 
34229
31.48 ct Tourmaline - Elbaite from Mozambique

31.48 ct tourmaline (elbaite)
Mozambique (PDF)

 
34492
48.86 ct Tourmaline - Elbaite from Mozambique

48.86 ct tourmaline (elbaite)
Mozambique (PDF)

 
34668


11.59 ct tourmaline (elbaite)
Myanmar (PDF)

 
34239
5.57 ct Tourmaline - Elbaite from Namibia

5.57 ct tourmaline (elbaite)
Namibia (PDF)

 
34724


7.55 ct tourmaline (elbaite)
Namibia (PDF)

 
34726
10.00 ct Tourmaline - Elbaite from Namibia

10.00 ct tourmaline (elbaite)
Namibia (PDF)

 
33629


11.62 ct tourmaline (elbaite)
Namibia (PDF)

 
34750
3.61 ct Tourmaline - Elbaite from Nepal

3.61 ct tourmaline (elbaite)
Nepal (PDF)

 
34749
5.50 ct Tourmaline - Elbaite from Nepal

5.50 ct tourmaline (elbaite)
Nepal (PDF)

 
33589


21.57 ct tourmaline (elbaite)
Nepal (PDF)

 
34945


11.60 ct tourmaline (elbaite)
Sri Lanka (PDF)

 
34245
4.88 ct Tourmaline - Elbaite from the United States

4.88 ct tourmaline (elbaite)
The United States (PDF)

 
33619
8.37 ct Tourmaline - Elbaite from Zambia

8.37 ct tourmaline (elbaite)
Zambia (PDF)

 
33585
40.08 ct Tourmaline - Elbaite (Achroite) from Brazil

40.08 ct tourmaline (elbaite) - achroite
Brazil (PDF)

 
33591
4.80 ct Tourmaline - Elbaite (Achroite) from the United States

4.80 ct tourmaline (elbaite) - achroite
The United States (PDF)

 
33679
3.88 ct Tourmaline - Elbaite (Indicolite) from Namibia

3.88 ct tourmaline (elbaite) - indicolite
Namibia (PDF)

 
33672
7.25 ct Tourmaline - Elbaite (Indicolite) from Namibia

7.25 ct tourmaline (elbaite) - indicolite
Namibia (PDF)

 
34728
9.19 ct Tourmaline - Elbaite (Indicolite) from Namibia

9.19 ct tourmaline (elbaite) - indicolite
Namibia (PDF)

 
34729
9.88 ct Tourmaline - Elbaite (Indicolite) from Namibia

9.88 ct tourmaline (elbaite) - indicolite
Namibia (PDF)

 
33671
1.80 ct Tourmaline - Elbaite (Indicolite) from Russia


1.80 ct tourmaline (elbaite) - indicolite
Russia (PDF)

 
35202



7.13 ct tourmaline (elbaite) - indicolite
The United States (PDF)

 
34500
11.41 ct Tourmaline - Elbaite (Rubellite) from Mozambique


11.41 ct tourmaline (elbaite) - rubellite
Mozambique (PDF)

 
34721


5.75 ct tourmaline (elbaite) - rubellite
Namibia (PDF)

 
35203


14.63 ct tourmaline (elbaite) - rubellite
The United States (PDF)

 
33588
16.84 ct Tourmaline - Elbaite (Rubellite) from the United States

16.84 ct tourmaline (elbaite) - rubellite
The United States (PDF)

 
33658
12.33 ct Tourmaline - Elbaite (Verdelite) from Afghanistan

12.33 ct tourmaline (elbaite) - verdelite
Afghanistan (PDF)

 
33665
6.02 ct Tourmaline - Elbaite (Verdelite) from Namibia

6.02 ct tourmaline (elbaite) - verdelite
Namibia (PDF)