New Synthetic Rubies Made by Professor P. O. Knischka
The Gemological Properties of Chatham Flux-Grown Synthetic Orange Sapphire and Synthetic Blue Sapphire
The author examines the gemological properties of Chatham flux-grown synthetic orange sapphires and blue sapphires.
A Computer Program for Gem Identification
The Chemical Distinction of Natural from Synthetic Emeralds
Natural and synthetic emeralds are studied to identify the chemical differences between them.
Inclusions in Taaffeites from Sri Lanka
Fascinating photomicrographs of inclusions in Sri Lankan taaffeites.
Faceted Chiolite
A very rare faceted “snow stone” was recently encountered in the Carlsbad laboratory.
Grossular Garnet Crystals in Demantoid Garnet
Demantoid garnet plays host to crystals of a different garnet species.
Imitation Opal with Interesting Play-of-Color Pattern
New imitation opal displays pronounced play-of-color phenomenon in a unique pattern covering large surface areas.
Johnkoivulaite: A New Gem Mineral
A new mineral, johnkoivualite, named after prominent GIA gemologist and photomicrographer.
Natural Sapphire with Trapiche Pattern Inclusions
Arrays of hexagonal particle inclusions resemble a trapiche pattern in this natural sapphire.
Uvarovite in Prehnite from Pangasinan Province, Philippines
Vibrant green uvarovite garnet in a white prehnite matrix with lapidary potential discovered in the Philippines.
Copper-Bearing Tourmalines from New Deposits in Paraíba State, Brazil
Two new deposits of Cu-bearing tourmaline have been found in Paraíba State, Brazil, not far from the original source at Mina da Batalha.
From Single Source to Global Free Market: The Transformation of the Cultured Pearl Industry
Over the past 15 years a combination of market forces, environmental events, and scientific research has radically changed the cultured pearl industry.
Update on Ammolite Production from Southern Alberta, Canada
There have been a number of changes in Ammolite production from southern Alberta, Canada, since 2001.
Polymer-Filled Aquamarine
The authors have encountered hundreds of polymer-filled aquamarines in the Chinese jewelry market.
A Crystallographic Analysis of the Tavernier Blue Diamond
This study uses both historical information and modern data to create a computer model of the Tavernier Blue, orienting the finished diamond within the original diamond crystal.
An Era of Sweeping Change in Diamond and Colored Stone Production Markets
The diamond, colored stone, and pearl businesses have witnessed unprecedented change since the turn of the 21st century.
Exploring the Origin and Nature of Luminescent Regions in CVD Synthetic Diamond
In the DiamondView instrument, blue to blue-green luminescent zones may be seen in CVD synthetic diamond when the growth run has been interrupted and resumed.
A History of Diamonds through Philately: The Frank Friedman Collection
South African jeweler Frank Friedman’s collection of diamond-themed stamps and other postal material offers an illuminating visual record of diamond history.
Ruby and Sapphire from the Tan Huong-Truc Lau Area, Yen Bai Province, Northern Vietnam
Primary and secondary deposits in the Tan Huong–Truc Lau area of northern Vietnam’s Yen Bai Province have supplied rubies and some sapphires for more than a decade.
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