| GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published by Struik...resources 12 Burundi 13 Kenya 14 Rwanda 16 Tanzania 17 Uganda 20 Gemological properties 21 A to...through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa, Kenya and Tanzania, with...starting in what was then Tanganyika ( now mainland Tanzania) and then progressing to Kenya - I am proud to...countries are among the finest in the world. The region and its gems are particularly dear to my family |
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(2008, January) Gems & Gemology Vol. 44 (4) Gemological Institute of America |
Journal (issue) |
| 322 Rubies and Sapphires from Winza, Central Tanzania Dietmar Schwarz, Vincent Pardieu, John M. Saul...“D-TO-Z” DIAMONDS diamonds from the Cape of Good Hope region, and “Jager” for colorless diamonds with strong...the blue region of the spectrum, as it is the absorption area of wavelengths in this region that allows...the 6-watt lamps used in the past. Here, the UV region shows good agreement between the three lamps. Note...that results in an additional emission in the red region between 620 and 700 nm that does not have a noticeable |
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(2004, April) Gems & Gemology Vol. 40 (1) Gemological Institute of America |
Journal (issue) |
| pink-orange spinel from Tanzania • Large tsavorite and green grossular from Tanzania • Color-change glass...late-1980s, the Diamond Trading Company, a De Beers Group company, has carried out proactive research to investigate...is produced at low pressures, typically in the region of one-tenth of atmospheric pressure, from carbon-con-...grown on a substrate held at a temperature in the region of 800–1000°C. For many industrial applications...carried out at temperatures and pressures (in the region of GEMS & GEMOLOGY SPRING 2004 3 Figure 2 |
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(2009, July) Gems & Gemology Vol. 45 (2) Gemological Institute of America |
Journal (issue) |
| “Sugarcane Emerald” from Brazil • Orange kyanite from Tanzania • Rare optical phenomenon in play-of-color opal...subscribers should add GST. Discounts are available for group subscriptions, renewals, GIA alumni, and current...Dona Dirlam wrote part of her 1992 “Gem Wealth of _Tanzania_” article sitting at my backyard patio table, while...gemological occurrence of pegmatitic gems in the region, as well as research. Based on his decade of experience...Dirlam et al. surveyed the colored stone wealth of Tanzania. Adolph Peretti and coauthors provided the authoritative |
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