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  1. www.gia.edu › gia-aboutThe GIA Difference - GIA.edu

    Há 3 dias · Gems & Gemology is redesigned, printed in full color, and goes on to win 15 awards for excellence during the next 20 years 1982 GIA Celebrates its 50th Anniversary with the first International Gemological Symposium

  2. www.gia.edu › gems-gemology › spring-2024-gemnewsNew Sapphire Material from Kashmir

    3 de mai. de 2024 · New Sapphire Material from Kashmir. Figure 1. Left: Two Kashmir sapphire rough crystals: 77.00 ct unheated (left) and 25.20 ct heated (right). Right: Unheated Kashmir sapphires. Left to right: 1.29 ct pear shape, 2.60 ct cushion cut, 21.09 ct dragon carving, and 4.08 ct oval cut. Photos by Robert Weldon; courtesy of Eddie Cleveland of ...

  3. www.gia.edu › gems-gemology › spring-2019-gemnewsLargest Square Cushion-Cut Tsavorite | Gems & Gemology - GIA

    Há 3 dias · At the AGTA show, Bridges Tsavorite unveiled the largest known square cushion-cut tsavorite, weighing 116.76 ct (see above). The 283.74 ct rough stone was mined by the company in Merelani, Tanzania, in September 2017. Bangkok-based gem cutter Victor Tuzlukov cut the stone at Bridges Tsavorite’s Arizona office over the course of a month in 2018.

  4. www.gia.edu › gems-gemology › spring-2020-gemnewsNigerian Gems and Jewelry | Gems & Gemology

    Há 1 dia · Nigerian sapphires are typically dark blue, although goods found in the southeastern part of the country tend to be lighter in color. Parti-colored, yellow, purplish, and green sapphires are also common. Figure 2. This necklace makes use of the Arewa knot, a symbol of unity. Photo by Kevin Schumacher.

  5. www.gia.edu › spring-2024-gems-gemology-in-briefSpring 2024 G&G Available Now - GIA

    3 de mai. de 2024 · Gems & Gemology Challenge. The spring issue also offers the 2024 Gems & Gemology Challenge quiz. Score 75% or better and you’ll receive a certificate of completion; earn a perfect score and your name will be listed in the Fall 2024 issue. Entries for the Challenge must be submitted online by September 1, 2024. About the Author.

  6. www.gia.edu › gems-gemology › spring-2020-labnotesFormation of the “Matryoshka” Diamond from Siberia

    20 de mai. de 2024 · The 0.62 ct green “Matryoshka” diamond (4.8 × 4.9 × 2.8 mm) from Siberia has an internal open cavity connected by two small channels to the outside. The surface is covered by etched trigons and striations. A small diamond crystal can move freely inside the cavity. Photo by Jianxin (Jae) Liao. A freely moving diamond trapped inside another ...

  7. www.igi.orgInternational Gemological Institute | Jewelry & Gemstone Grading

    20 de mai. de 2024 · ESG. IGI is equally committed to all three facets of ESG – focusing on environmental, social and governance matters internally and externally. IGI’s supreme position in the gemological world is no coincidence. It is the result of continuous research, support and synergy with professionals and consumers alike.