GIA's Gübelin Gem Project: Various Gems, Kornerupine - Natrolite

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.

 

34702 2.60 ct jeremejevite Namibia (PDF)	34365 1.64 ct kornerupine Kenya (PDF)	34366 1.80 ct kornerupine Kenya (PDF)
34368 5.54 ct kornerupine Kenya (PDF)	34067 3.96 ct kornerupine Sri Lanka (PDF)	34848 4.90 ct kornerupine Sri Lanka (PDF)
34069 7.11 ct kornerupine Sri Lanka (PDF)	34851 7.43 ct kornerupine Sri Lanka (PDF)	34850 7.86 ct kornerupine Sri Lanka (PDF)
34063 11.19 ct kornerupine Sri Lanka (PDF)	35016 4.39 ct kornerupine Tanzania (PDF)	34274 6.10 ct kyanite Brazil (PDF)
34276 7.81 ct kyanite Brazil (PDF)	33854 8.37 ct kyanite Brazil (PDF)	33849 18.43 ct kyanite Brazil (PDF)
34352 4.44 ct kyanite Kenya (PDF)	33835 2.77 ct kyanite Madagascar (PDF)	35630 15.30 ct kyanite Myanmar (PDF)
33839 3.68 ct kyanite Nepal (PDF)	34742 5.78 ct kyanite Nepal (PDF)	34964 3.85 ct kyanite Switzerland (PDF)
34993 15.81 ct kyanite Tanzania (PDF)	35283 3.55 ct kyanite Zimbabwe (PDF)	35287 5.05 ct kyanite Zimbabwe (PDF)
35579 3.51 ct leadhillite Namibia (PDF)	35442 1.52 ct leucite Italy (PDF)	35411 12.93 ct magnesite Brazil (PDF)
34483 3.51 ct manganotantalite Mexico (PDF)	35448 5.51 ct manganotantalite Mozambique (PDF)	35449 9.90 ct manganotantalite Pakistan (PDF)
35453 4.46 ct mimetite Namibia (PDF)	35581 1.01 ct monazite Brazil (PDF)	35456 1.34 ct montebrasite Brazil (PDF)
34258 46.28 ct montebrasite Brazil (PDF)	35836 3.58 ct musgravite (magnesiotaaffeite) Locality not stated (PDF)	35190 4.54 ct natrolite The United States (PDF)