Overview and commentary on the 2013 The Journal of Gemmology article “Peñas Blancas: An Historic Colombian Emerald Mine."

A look at the first CVD synthetic diamond examined at GIA that has been irradiated to a blue color.

A rare look at natural pearls from a known Spondylus species, commonly called “thorny” oysters.

Overview and commentary on the 2014 Journal of Gemmology article “Purple to Reddish Purple Chrysoberyl from Brazil.”

Describes the phenomenon of pleochroism and its complex effect on the appearance of colored stones.

Examines the internal structure, chemical composition, and spectroscopic features of 22 pen pearls.

Introduces the Chinese nephrite mine in Hechi and characterizes the “band” and dendritic patterns found in this material.

Review of Suzanne Ramljak's Unique by Design: Contemporary Jewelry in the Donna Schneier Collection.

Review of Richard Hughes’s Ruby & Sapphire: A Collector’s Guide.

Review of Ronald McIntosh and Warren Anderson's Kentucky Agate: State Rock and Mineral Treasure of the Commonwealth.

Review of Stefano Papi’s Jewels of the Romanovs: Family & Court.

This aquamarine's most striking feature was its unusually strong dichroism, displaying very deep blue and pale bluish green colors.

The Indian Gemological Institute’s Gem Testing Laboratory recently examined a 0.30 ct colorless round brilliant-cut diamond containing an interesting inclusion.

A summary of gemological presentations from the 21st IMA General Meeting in Johannesburg.

This giant clam pearl was noteworthy for its size and interesting coloration, and its pronounced banding when viewed with transmitted light.

Review of Martin Chapman and Amanda Triossi’s The Art of Bulgari: La Dolce Vita and Beyond, 1950–1990.

An investigation of a coated fire opal recently found in the Chinese market.

Review of Paul Koudounaris’s Heavenly Bodies: Cult Treasures and Spectacular Saints from the Catacombs.

Reports on the first discovery of fine topazolite garnet crystals in Mexico.

在洛杉矶郡自然历史博物馆探索著名的宝石和矿物参考馆藏。