Article Search Results

Types

Articles (214)

Content Type

Lab Notes (6) Gem News International (19) Abstract (9) Feature (27) Micro-World (1)

Reviewed

Peer Reviewed (143)

Topics

See All Topics

Gemstones

Diamond (31) Sapphire (24) Emerald (19) Ruby (17) Pearl (10) See All Gemstones

XClear Selections

Figure 1. The deep colors of green and brown augite from Dong Nai, observed in transmitted light. Top: The 9.78 g rough on the left yielded a 24.20 ct carving (24.99 cm in height). Bottom: The 11.22 g rough on the left yielded a 56.10 ct carving (36.50 cm in height). Photos by Le Ngoc Nang.

Gem-Quality Augite from Dong Nai, Vietnam

Le Ngoc Nang, Lam Vinh Phat, Pham Minh Tien, Pham Trung Hieu, Kenta Kawaguchi, and Pham Minh, August 4, 2023

Offers a comprehensive look at a variety of augite from Dong Nai, Vietnam, detailing its formation and gemological characteristics.

Article

Summer 2023 G&G Available Now

Erica Zaidman, August 4, 2023

An overview of the Summer 2023 Gems & Gemology content.

Figure 1. Mammoth ivory carving with part of the brown surface retained to depict the characters. Courtesy of Duo Wang.

Origins of Color in Brown Mammoth Ivory

Zhaoying Huang, Tao Chen, Jinyu Zheng, Duo Wang, and Xing Xu, August 4, 2023

Investigates the mineral and chemical compositions and surface morphology characteristics of brown mammoth ivory to identify the origins of its brown color.

Figure 1. Suite of faceted nickel-diffused spinel (0.67–1.01 ct) showing a range of color from blue to bluish green. Photo by Aaron Palke and Diego Sanchez.

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, August 4, 2023

Reports on a newly discovered treatment process for producing a deep blue color in natural spinel and proposes identification criteria.

Bavenite in Quartz

Maxwell Hain, July 22, 2020

Faceted quartz contains numerous unusual white radial inclusions identified as bavenite.

Vietnamese peridot nodules, rough stones, and faceted samples

Peridot from the Central Highlands of Vietnam: Properties, Origin, and Formation

Nguyen Thi Minh Thuyet, Christoph Hauzenberger, Nguyen Ngoc Khoi, Cong Thi Diep, Chu Van Lam, Nguyen Thi Minh, Nguyen Hoang, and Tobias Häger, November 7, 2016

Analyzes the gemological and geochemical characteristics of peridot from the Gia Lai province alongside specimens from other localities to gain insight into its formation.

Faceted peridot from the Pyaung-Gaung mine in Mogok

Gemological Characterization of Peridot from Pyaung-Gaung in Mogok, Myanmar

Montira Seneewong-Na-Ayutthaya, Wassana Chongraktrakul, and Tasnara Sripoonjan, January 28, 2022

Examines the mining and the internal, spectroscopic, and chemical features of peridot from this deposit, which possesses a rich olive green color and is available in large sizes.

Figure 1. Part of the suite of sapphires studied for this project (weighing 0.23–1.41 ct). Photo by Sasithorn Engniwat; courtesy of Greenland Ruby.

Color Study of Fancy Sapphire from Greenland

Wim Vertriest, Charuwan Khowpong, Polthep Sakpanich, and Martin Viala, May 23, 2023

The Bangkok laboratory identifies the chromophores responsible for the fancy colors observed in treated sapphire from Aappaluttoq, Greenland.

Figure 1. Twelve Chilean abalone cultured pearls and two red abalone (<i>Haliotis rufescens</i>) shells with attached cultured shell blisters, as well as three 7 mm traditional freshwater shell bead nuclei used to culture the pearls. Photo by Emily Lane.

Bead Cultured Abalone Pearls from Chile

Artitaya Homkrajae, Amiroh Steen, Matthew Hardman, Ziyin Sun, Rubén Araya Valencia, and Jaime Pablo Maturana Zuñiga, May 23, 2023

A study of abalone bead cultured pearls from a new pearl culturing technique tested in Chile.

Sapphire from Montana’s Secondary Deposits, Colombian Emerald Morphology, the 2023 Tucson Shows, and More…

Duncan Pay, May 23, 2023

An overview of the Spring 2023 Gems & Gemology content.

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Gemstones

Find a Retailer

Shop the Campus Store

Subscribe to Knowledge Rocks Emails

Learn About Diamond Origin Reports