Gemological Characterization of Montana Sapphire from the Secondary Deposits at Rock Creek, Missouri River, and Dry Cottonwood Creek
Examines the mining history and geological characteristics of the three secondary sapphire deposits in the state of Montana, as well as the properties of these sapphires (unheated and heat-treated).
Morphology of Colombian Emerald: Some Less-Common Cases and Their Growth and Dissolution History
Evaluates the growth mechanisms of special morphological features in Colombian emerald, including possible relationships to trapiche emeralds and samples displaying the gota de aceite effect.
Starry Night in Diamond
Cloud inclusions resembling stars at night are observed in a faceted diamond.
Spring 2023 G&G Publication Information
This document provides the publication information for Gems & Gemology