GIA Gem Project
Tourmaline

Color-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 recognized within this group. Their highly variable chemical composition gives rise to a wide range of colors. Among the many varieties of elbaite tourmaline are verdelite (green), indicolite (blue) and rubellite (red). Some tourmaline specimens display multiple colors. Optical effects include pleochroism (a change of color 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)

 
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)

 

GIA Gem Project

GIA has studied more than 400 important gemstones in the Edward J. Gübelin Gem Collection and is committed to sharing this repository of gemological information.

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