GIA has announced the release of the Summer 2023 Gems & Gemology (G&G) issue. G&G Summer looks at timely topics including a new treatment process identified in natural spinel, a recently discovered source of augite in Vietnam and the origin of color in brown mammoth ivory.
Explore each of these topics further in the Summer 2023 G&G issue:
Color Modification of Spinel by Nickel Diffusion: A New Treatment
Michael Jollands, Abadie Ludlam, Aaron C. Palke, Wim Vertriest, Shiyun Jin, Pamela Cevallos, Sarah Arden, Elina Myagkaya, Ulrika D’Haenens-Johannson, Vararut Weeramongkhonlert, and Ziyin Sun
A team of GIA researchers reports on a newly discovered treatment process for producing a deep blue color in natural spinel and proposes identification criteria.
Gem-Quality Augite from Dong Nai
Le Ngoc Nang, Lam Vinh Phat, Pham Minh Tien, Pham Trung Hieu, Kenta Kawaguchi, and Pham Minh
Offers a comprehensive look at a variety of augite from Dong Nai, Vietnam, detailing its formation and gemological characteristics.
Origins of Color in Brown Mammoth Ivory
Zhaoying Huang, Tao Chen, Jinyu Zheng, Duo Wang, and Xing Xu
Investigates the mineral and chemical composition and surface morphology characteristics of brown mammoth ivory to identify the origins of its brown color.
This and every issue of G&G since 1934 are available at no cost on GIA’s website at GIA.edu/gems-gemology.
Additionally, G&G’s regular features include:
- Lab Notes informs readers of exciting global discoveries, such as a CVD-grown diamond over 34 carats.
- Micro-World explores the inner wonders of gemstones, including a feather inclusion that resembles a mountain range.
- Colored Stones Unearthed looks at geological concepts related to colored stone formation.
- Gem News International covers notable developments; this issue highlights the characteristics of treated rubies from Greenland.
- In the Spotlight shares the vivid spectrum of iridescent colors in a rare volcanic glass found in Oregon.
Join the conversations on GIA’s Gems & Gemology Facebook group with an online community of more than 35,000 members. Additional research articles are available at GIA.edu/gia-news-research.
