Garnets from Altay, China
A Study of the Gems in Ciborium from Einsiedeln Abbey
The gemstones that adorn a late-16th-century ciborium from Einsiedeln Abbey in Einsiedeln, Switzerland.
Beryl Gem Nodules from the Bananal Mine, Minas Gerais, Brazil
Bicolored (aquamarine-morganite) beryl from a 1986 discovery at the Bananal mine is described.
Meerschaum from Eskisehir Province, Turkey
This study presents a model for the origin of the Eskisehir, Turkey, sepiolite deposits.
A New Defect Center in Type Ib Diamond Inducing One Phonon Infrared Absorption: The Y Center
This paper describes the discovery of a new defect center in natural and synthetic type Ib diamonds, named the Y center.
Perles de Culture de la Mer de Cortez: Les Belles Inconnues [Unknown Beauties: Cultured Pearls from the Cortez Sea]
The “Glet Filling”: The Filling of the Cracks in Precious Stones Under Scrutiny
This short article discusses several important aspects of crack-filling in colored stones and diamonds.
Gem Olivine and Calcite Mineralization Precipitated from Subduction-Derived Fluids in the Kohistan Arc-Mantle (Pakistan)
Examination of Three-Phase Inclusions in Colorless, Yellow, and Blue Sapphires from Sri Lanka
Three-phase inclusions in untreated natural colorless, yellow, and blue sapphires from Sri Lanka were found to consist of liquid and gaseous carbon dioxide as well as needle-like to tabular crystals of diaspore.
Well-Formed Tsavorite Gem Crystals from Tanzania
Green grossular garnet crystals of fine form and clarity have been found recently in Tanzania.
Emeralds and Green Beryls of Upper Egypt
Ancient Tourmaline and Beryl from Afghanistan
Examination of a large private collection of beads and carvings from antique excavations, assembled in the 1970s by a collector in Afghanistan.
Banded Mimetite
Yellow transparent mimetite—known to collectors as one of the rarest faceted stones—purchased in Tuscon and likely from Bolivia.
Update on Mexifire Synthetic Fire Opal
As a result of changes in the manufacturing process, recent production of the synthetic fire opal marketed as “Mexifire” exhibits some new properties.
Yellow Scapolite from Ihosy, Madagascar
Attractive yellow to light greenish yellow gem scapolites have been mined from a skarn deposit near the town of Ihosy.
Almandine in Graphite Schist Specimens
Almandine garnet in graphite schist was on display in Tucson.
Unusual Yellowish Green Spinel
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