GIA's Gübelin Gem Project: Various Gems, Danburite – Humite

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  Madagascar (PDF)	34390 30.37 ct danburite Madagascar (PDF)	34451 6.78 ct danburite Mexico (PDF)
34557 25.30 ct danburite Myanmar (PDF)	35375 6.51 ct danburite Russia (PDF)	34810 6.37 ct danburite Sri Lanka (PDF)
34808 11.12 ct danburite Sri Lanka (PDF)	35177 5.66 ct danburite The United States (PDF)	35178 12.12 ct datolite The United States (PDF)
33818 0.47 ct diamond Locality not stated (PDF)	35378 13.18 ct diaspore Turkey (PDF)	34699 4.30 ct dioptase Namibia (PDF)
35391 7.88 ct dolomite Locality not stated (PDF)	35183 14.36 ct dolomite The United States (PDF)	34362 2.85 ct epidote Kenya (PDF)
34704 4.21 ct epidote Namibia (PDF)	34004 9.72 ct epidote Locality not stated (PDF)	34830 9.02 ct epidote Sri Lanka (PDF)
35187 2.97 ct epidote The United States (PDF)	34010 7.17 ct euclase Brazil (PDF)	34279 7.79 ct euclase Brazil (PDF)
34834 8.06 ct euclase Sri Lanka (PDF)	35398 1.81 ct euclase Zimbabwe (PDF)	35285 2.87 ct euclase Zimbabwe (PDF)
35575 1.52 ct eudialyte Canada (PDF)	33116 6.30 ct feldspar (albite) Kenya (PDF)	34347 10.48 ct feldspar (albite) Kenya (PDF)
35625 6.00 ct feldspar (andesine) China (PDF)	34469 7.81 ct feldspar (bytownite) Mexico (PDF)	33096 30.82 ct feldspar (labradorite) Finland (PDF)
33138 2.60 ct feldspar (labradorite) The United States (PDF)	35197 7.71 ct feldspar (labradorite) The United States (PDF)	33097 22.01 ct feldspar (labradorite) The United States (PDF)
33121 7.81 ct feldspar (oligoclase) Canada (PDF)	33124 11.35 ct feldspar (oligoclase) India (PDF)	33122 12.72 ct feldspar(oligoclase) - sunstone Tanzania (PDF)
33098 25.33 ct feldspar (orthoclase) Madagascar (PDF)	34392 58.57 ct feldspar (orthoclase) Madagascar (PDF)	34569 15.21 ct feldspar (orthoclase) Myanmar (PDF)
35482 14.79 ct feldspar (orthoclase) Locality not stated (PDF)	34839 4.37 ct feldspar (orthoclase) Sri Lanka (PDF)	34837 14.64 ct feldspar (orthoclase) Sri Lanka (PDF)
35200 27.58 ct feldspar (orthoclase) The United States (PDF)	34314 8.57 ct feldspar (orthoclase) - moonstone India (PDF)	34856 21.22 ct feldspar (orthoclase) - moonstone Sri Lanka (PDF)
33094 28.96 ct feldspar (sanidine) Germany (PDF)	33150 42.95 ct fluorite Afghanistan (PDF)	34410 12.84 ct fluorite Madagascar (PDF)
34388 51.10 ct fluorite Madagascar (PDF)	34020 2.87 ct fluorite Namibia (PDF)	33143 48.80 ct fluorite Namibia (PDF)
34871 29.94 ct fluorite Sri Lanka (PDF)	34971 6.43 ct fluorite Switzerland (PDF)	34989 57.77 ct fluorite Switzerland (PDF)
35153 23.74 ct fluorite The United States (PDF)	33149 47.62 ct fluorite The United States (PDF)	34280 17.54 ct gahnite Brazil (PDF)
34029 3.27 ct hambergite Madagascar (PDF)	35629 0.29 ct grandidierite Sri Lanka (PDF)	34028 3.43 ct hambergite Madagascar (PDF)
34032 3.58 ct hambergite Madagascar (PDF)	34412 5.36 ct hambergite Madagascar (PDF)	34736 5.17 ct hambergite Nepal (PDF)
35406 1.00 ct haüyne Germany (PDF)	35421 2.40 ct herderite Brazil (PDF)	34283 4.93 ct herderite Brazil (PDF)
34282 6.13 ct herderite  Brazil (PDF)	35408 7.12 ct herderite Brazil (PDF)	35365 17.16 ct herderite Brazil (PDF)
35435 2.14 ct humite (clinohumite) Tajikistan (PDF)