Article Search Results

Show Filters
Showing 54 results for "*"
A blue synthetic star sapphire from past production of Wiede’s Carbidwerk
Synthetic Star Sapphires and Rubies Produced by Wiede’s Carbidwerk, Freyung, Germany

Details the process used by Wiede’s Carbidwerk to produce star synthetic corundum from the mid-1950s through the 1970s.

Read More

Diamond octahedron, diamond bort, and carbonado
Carbonado Diamond: A Review of Properties and Origin

Presents a detailed examination of about 800 samples of carbonado diamond from Brazil and the Central African Republic, including possible models for its genesis.

Read More

Iridescence in iris quartz from Jalgaon, India
Causes of Iridescence in Natural Quartz

Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.

Read More

chrysoberyl samples
Chrysoberyl from the New England Placer Deposits, New South Wales, Australia

Examines a collection of chrysoberyl samples from these sapphire placer deposits to determine their distinct mineralogical and chemical properties.

Read More

Colombian Trapiche Emeralds: Recent Advances in Understanding Their Formation

Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.

Read More

Color zoning in amethyst from Boudi, Morocco
Amethyst from Boudi, Morocco

An introduction to Moroccan amethyst, which features distinctive color zoning and inclusions.

Read More

A bright orange, multi-faceted gem.
Article
Fall for Autumn Gems

Nature gives us a brilliant palette of color-changing leaves and a spectacular kaleidoscope of colorful sunsets during the fall season.

Read More

DiamondView Imaging of the Pavilion Facets
Pseudo-Synthetic Growth Structure Observed in Natural Diamond

This stone was a good example of a very rare natural diamond exhibiting synthetic growth characteristics.

Read More

145954
Rare Double-trapiche Emerald

At the AGTA show, Equatorian Imports showed this contributor two pieces of emerald with a very rare double-trapiche pattern

Read More

Rainbow hematite from Brazil’s Andrade mine.
Iridescence in Metamorphic “Rainbow” Hematite

Analyzes the substructures that cause the intense iridescence observed in “rainbow” hematite from Minas Gerais, Brazil.

Read More