GIA Gem Project
Various gems
(Danburite – Humite)


Danburite
Photo by Robert Weldon/GIA, courtesy Dr E. J. Gübelin Collection
GIA Collection 35375
Among the collection assembled by Dr Edward Gübelin are a number of uncommon gemstones from many worldwide localities. Documents, like the ones below, present information on gemstones that range from occasional use in jewellery to those that are quite rare and seldom faceted because of the lack of suitable starting material.

34391
15.81 ct Danburite from Madagascar
15.81 ct Danburite from Madagascar (PDF)


34451

6.78 ct Danburite from Mexico (PDF)


34557

25.30 ct Danburite from Myanmar (PDF)


35375
6.51 ct Danburite from Russia
6.51 ct Danburite from Russia (PDF)


34810

6.37 ct Danburite from Sri Lanka (PDF)


34808

11.12 ct Danburite from Sri Lanka (PDF)


35177

5.66 ct Danburite from the United States (PDF)


35178
12.12 ct Datolite from the United States
12.12 ct Datolite from the United States (PDF)


33818

0.47 ct Diamond, Locality not stated (PDF)


35378
13.18 ct Diaspore from Turkey
13.18 ct Diaspore from Turkey (PDF)


34699

4.30 ct Dioptase from Namibia (PDF)


35391
7.88 ct Dolomite
7.88 ct Dolomite, locality not stated (PDF)


35183

14.36 ct Dolomite from the United States (PDF)


34362

2.85 ct Epidote from Kenya (PDF)


34704

4.21 ct Epidote from Namibia (PDF)


34004
9.72 ct Epidote
9.72 ct Epidote, locality not stated (PDF)


34830

9.02 ct Epidote from Sri Lanka (PDF)


35187
2.97 ct Clinozoisite from the United States
2.97 ct Epidote from the United States (PDF)


34010
7.17 ct Euclase from Brazil
7.17 ct Euclase from Brazil (PDF)


34279
7.79 ct Euclase from Brazil
7.79 ct Euclase from Brazil (PDF)


34834

8.06 ct Euclase from Sri Lanka (PDF)


35398
1.81 ct Euclase from Zimbabwe
1.81 ct Euclase from Zimbabwe (PDF)


35285

2.87 ct Euclase from Zimbabwe (PDF)


35575
1.52 ct Eudialyte from Canada
1.52 ct Eudialyte from Canada (PDF)


34347

10.48 ct Feldspar (Albite) from Kenya (PDF)


33138
2.60 ct Feldspar – Labradorite from the United States
2.60 ct Feldspar (Labradorite) from the United States (PDF)


35197

7.71 ct Feldspar (Labradorite) from the United States (PDF)


33097
22.01 ct Feldspar – Labradorite from the United States
22.01 ct Feldspar (Labradorite) from the United States (PDF)


33121
7.81 ct Oligoclase from Canada
7.81 ct Feldspar (Oligoclase) from Canada (PDF)


33124
11.35 ct Feldspar – Oligoclase from India
11.35 ct Feldspar (Oligoclase) from India (PDF)


33122
12.72 ct Oligoclase – Sunstone from Tanzania
12.72 ct Feldspar (Oligoclase) – Sunstone from Tanzania (PDF)


33098
25.33 ct Orthoclase from Madagascar
25.33 ct Feldspar (Orthoclase) from Madagascar (PDF)


34392
58.57 ct Orthoclase from Madagascar 150x113
58.57 ct Feldspar (Orthoclase) from Madagascar (PDF)


34569
15.21 ct Feldspar – Oligoclase from Myanmar
15.21 ct Feldspar (Orthoclase) from Myanmar (PDF)


35482

14.79 ct Feldspar (Orthoclase), locality not stated (PDF)


34839

4.37 ct Feldspar (Orthoclase) from Sri Lanka (PDF)


34837

14.64 ct Feldspar (Orthoclase) from Sri Lanka (PDF)


35200

27.58 ct Feldspar (Orthoclase) from the United States (PDF)


34314

8.57 ct Feldspar (Orthoclase) – Moonstone from India (PDF)


34856

21.22 ct Feldspar (Orthoclase) – Moonstone from Sri Lanka (PDF)


33094
28.96 ct Sanidine from Germany
28.96 ct Feldspar (Sanidine) from Germany (PDF)


33150
42.95 ct Fluorite from Afghanistan
42.95 ct Fluorite from Afghanistan (PDF)


34410

12.84 ct Fluorite from Madagascar (PDF)


34388
51.10 ct Fluorite from Madagascar
51.10 ct Fluorite from Madagascar (PDF)


34020

2.87 ct Fluorite from Namibia (PDF)


33143
48.80 ct Fluorite from Namibia
48.80 ct Fluorite from Namibia (PDF)


34871

29.94 ct Fluorite from Sri Lanka (PDF)


34971

6.43 ct Fluorite from Switzerland (PDF)


34989
57.77 ct Fluorite from Switzerland
57.77 ct Fluorite from Switzerland (PDF)


35153

23.74 ct Fluorite from the United States (PDF)


33149
47.62 ct Fluorite from the United States
47.62 ct Fluorite from the United States (PDF)


34280
17.54 ct Gahnite from Brazil
17.54 ct Gahnite from Brazil (PDF)


34029

3.27 ct Hambergite from Madagascar (PDF)


34028

3.43 ct Hambergite from Madagascar (PDF)


34032
3.58 ct Hambergite from Madagascar
3.58 ct Hambergite from Madagascar (PDF)


34412
5.36 ct Hambergite from Madagascar
5.36 ct Hambergite from Madagascar (PDF)


34736

5.17 ct Hambergite from Nepal (PDF)


35406
1.00 ct Hauyne from Germany 150x113
1.00 ct Haüyne from Germany (PDF)


35421

2.40 ct Herderite from Brazil (PDF)


34283
4.93 ct Herderite from Brazil
4.93 ct Herderite from Brazil (PDF)


34282
6.13 ct Herderite from Brazil 150x113
6.13 ct Herderite from Brazil (PDF)


35408
7.12 ct Herderite from Brazil
7.12 ct Herderite from Brazil (PDF)


35365
17.16 ct Herderite from Brazil
17.16 ct Herderite from Brazil (PDF)


35435

2.14 ct Humite (Clinohumite) from Tajikistan (PDF)