GIA 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) from Kenya (PDF)


34461

4.17 ct Tourmaline (Dravite) from Mexico (PDF)


33635
31.21 ct Tourmaline - Dravite from Mozambique
31.21 ct Tourmaline (Dravite) from Mozambique (PDF)


34666

3.24 ct Tourmaline (Dravite) from Myanmar (PDF)


35064

10.36 ct Tourmaline (Dravite) from Tanzania (PDF)


33648
12.33 ct Tourmaline - Elbaite from Afghanistan
12.33 ct Tourmaline (Elbaite) from Afghanistan (PDF)


33604
4.52 ct Tourmaline - Elbaite from Brazil
4.52 ct Tourmaline (Elbaite) from Brazil (PDF)


33617
7.23 ct Tourmaline - Elbaite from Brazil
7.23 ct Tourmaline (Elbaite) from Brazil (PDF)


33606
8.01 ct Tourmaline - Elbaite from Brazil
8.01 ct Tourmaline (Elbaite) from Brazil (PDF)


34310
13.27 ct Tourmaline - Elbaite from Brazil
13.27 ct Tourmaline (Elbaite) from Brazil (PDF)


34309
16.87 ct Tourmaline - Elbaite from Brazil
16.87 ct Tourmaline (Elbaite) from Brazil (PDF)


34311
20.15 ct Tourmaline - Elbaite from Brazil
20.15 ct Tourmaline (Elbaite) from Brazil (PDF)


34379
3.36 ct Tourmaline - Elbaite from Kenya
3.36 ct Tourmaline (Elbaite) from Kenya (PDF)


33624
3.68 ct Tourmaline - Elbaite from Kenya
3.68 ct Tourmaline (Elbaite) from Kenya (PDF)


33683
6.53 ct Tourmaline - Elbaite from Madagascar
6.53 ct Tourmaline (Elbaite) from Madagascar (PDF)


34507
7.13 ct Tourmaline - Elbaite from Mozambique
7.13 ct Tourmaline (Elbaite) from Mozambique (PDF)


34531
7.50 ct Tourmaline - Elbaite from Mozambique
7.50 ct Tourmaline (Elbaite) from Mozambique (PDF)


33612
8.05 ct Tourmaline - Elbaite from Mozambique
8.05 ct Tourmaline (Elbaite) from Mozambique (PDF)


34524
12.87 ct Tourmaline - Elbaite from Mozambique
12.87 ct Tourmaline (Elbaite) from Mozambique (PDF)


34526
16.08 ct Tourmaline - Elbaite from Mozambique
16.08 ct Tourmaline (Elbaite) from Mozambique (PDF)


34229
31.48 ct Tourmaline - Elbaite from Mozambique
31.48 ct Tourmaline (Elbaite) from Mozambique (PDF)


34492
48.86 ct Tourmaline - Elbaite from Mozambique
48.86 ct Tourmaline (Elbaite) from Mozambique (PDF)


34668

11.59 ct Tourmaline (Elbaite) from Myanmar (PDF)


34239
5.57 ct Tourmaline - Elbaite from Namibia
5.57 ct Tourmaline (Elbaite) from Namibia (PDF)


34724

7.55 ct Tourmaline (Elbaite) from Namibia (PDF)


34726
10.00 ct Tourmaline - Elbaite from Namibia
10.00 ct Tourmaline (Elbaite) from Namibia (PDF)


33629

11.62 ct Tourmaline (Elbaite) from Namibia (PDF)


34750
3.61 ct Tourmaline - Elbaite from Nepal
3.61 ct Tourmaline (Elbaite) from Nepal (PDF)


34749
5.50 ct Tourmaline - Elbaite from Nepal
5.50 ct Tourmaline (Elbaite) from Nepal (PDF)


33589

21.57 ct Tourmaline (Elbaite) from Nepal (PDF)


34945

11.60 ct Tourmaline (Elbaite) from Sri Lanka (PDF)


34245
4.88 ct Tourmaline - Elbaite from the United States
4.88 ct Tourmaline (Elbaite) from the United States (PDF)


33619
8.37 ct Tourmaline - Elbaite from Zambia
8.37 ct Tourmaline (Elbaite) from Zambia (PDF)


33585
40.08 ct Tourmaline - Elbaite (Achroite) from Brazil
40.08 ct Tourmaline (Elbaite) – Achroite from Brazil (PDF)


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


33679
3.88 ct Tourmaline - Elbaite (Indicolite) from Namibia
3.88 ct Tourmaline (Elbaite) – Indicolite from Namibia (PDF)


33672
7.25 ct Tourmaline - Elbaite (Indicolite) from Namibia
7.25 ct Tourmaline (Elbaite) – Indicolite from Namibia (PDF)


34728
9.19 ct Tourmaline - Elbaite (Indicolite) from Namibia
9.19 ct Tourmaline (Elbaite) – Indicolite from Namibia (PDF)


34729
9.88 ct Tourmaline - Elbaite (Indicolite) from Namibia
9.88 ct Tourmaline (Elbaite) – Indicolite from Namibia (PDF)


33671
1.80 ct Tourmaline - Elbaite (Indicolite) from Russia
1.80 ct Tourmaline (Elbaite) – Indicolite from Russia (PDF)


35202

7.13 ct Tourmaline (Elbaite) – Indicolite from the United States (PDF)


34500
11.41 ct Tourmaline - Elbaite (Rubellite) from Mozambique
11.41 ct Tourmaline (Elbaite) – Rubellite from Mozambique (PDF)


34721

5.75 ct Tourmaline (Elbaite) – Rubellite from Namibia (PDF)


35203

14.63 ct Tourmaline (Elbaite) – Rubellite from the United States (PDF)


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


33658
12.33 ct Tourmaline - Elbaite (Verdelite) from Afghanistan
12.33 ct Tourmaline (Elbaite) – Verdelite from Afghanistan (PDF)


33665
6.02 ct Tourmaline - Elbaite (Verdelite) from Namibia
6.02 ct Tourmaline (Elbaite) – Verdelite from Namibia (PDF)