Flux-Grown Synthetic Red and Blue Spinels from Russia
Examination of red and blue samples of a relatively new flux synthetic spinel from Russia established criteria by which they can be separated from their natural counterparts.
Dreamy Drusy: Minute Crystals Shimmer in Dramatic Designs
Drusy jewelry has surged in popularity in recent years. Celebrities wear it on the red carpet and designers clamor for it at gem shows.
Rubies and Sapphires from Snezhnoe, Tajikistan
This large marble-hosted occurrence in the Pamir Mountains is a potentially productive source of corundum, including ruby with a bright red color reminiscent of “pigeon’s blood” Burmese rubies.
“Diffusion Ruby” Proves to be Synthetic Ruby Overgrowth on Natural Corundum
A relatively new production of red corundum, reportedly from Bangkok, has been offered for sale in recent years.
Gem Pegmatites of Minas Gerais, Brazil: Exploration, Occurrence, and Aquamarine Deposits
First in a series, this article reviews the exploration for gemstones and mining methods in Minas Gerais, Brazil.
On the Origin of Digit Patterns in Gem Opal
An examination of the finger-like feature mostly found in Ethiopian opal, and proposal for its formation.
Aquamarine from the Masino-Bregaglia Massif, Central Alps, Italy
Aquamarine from granitic pegmatites of the Masino-Bregaglia Massif, Central Alps, Italy.
Colombian Trapiche Emeralds: Recent Advances in Understanding Their Formation
Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.
Tugtupite: A Gemstone from Greenland
Gem-quality tugtupite has come almost exclusively from one occurrence.
Synthetic Rubies by Douros: A New Challenge for Gemologists
Greek manufacturer J. & A. Douros introduced a new flux synthetic ruby in early 1993.