“Flower in the Rain” Inclusion in Sri Lankan Sapphire
A growth blockage/fluid inclusion combination in a blue sapphire from Sri Lanka resembles a bloom in a rainstorm.
Photoluminescence Spectra of Emeralds from Colombia, Afghanistan, and Zambia
Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.
Observations on HPHT-Grown Synthetic Diamonds: A Review
Summarizes statistical data and distinctive features of several thousand gem-quality HPHT synthetic diamonds examined by GIA from 2007 through 2016.
Colombian Emerald Industry: Winds of Change
A firsthand look at Colombia’s emerald mines and the cutting and trading industry in Bogotá.
Update on Mozambique Ruby Mining and Trading
Current activity and production at various sites around Mozambique are reported.
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.
Quarterly Crystal: Barite in Fluorite
A fluorite specimen hosts two eye-visible, prominent white barite inclusions.
Hematite in Quartz: “A Rose by Any Other Name”
A quartz cabochon hosts an unusual rose-shaped hematite inclusion.
Blue-Green Pyrope-Spessartine Garnet with High Vanadium
Garnets with a unique color and a previously unreported chemical composition are examined at GIA’s Carlsbad lab.
The “Montana Queen” Sapphire
A rough blue sapphire crystal from the Rock Creek deposit is heat treated and cut to become the largest known faceted blue Montana sapphire.
A Review of HPHT Synthetic Diamonds Grown forJewelry Use
An overview of the Fall 2017 Gems & Gemology content.
Awards for James Shigley and Jonathan Muyal
Two regular G&G contributors receive awards for their work in the field of gemology.
Silvery Rutile “Tufts” in Quartz
書評: 『Taffin: The Jewelry of James de Givenchy（タフィン：ジェームズ・ド・ジバンシーのジュエリー）』
James Taffin de Givenchy、Tobias Meyere、Hamilton South共著の『Taffin: The Jewelry of James de Givenchy（タフィン：ジェームズ・ド・ジバンシーのジュエリー）』の書評
Multi-Color-Zoned Quartz from Brazil
A Brazilian quartz with unusual color zoning caused by variable iron content is examined.
Yellow, Green, and Blue Sapphires Reportedly from Antang and Gombe, Nigeria
Nineteen sapphires of various colors, reportedly from sources in northern Nigeria, are studied in GIA’s Tokyo laboratory.
Flux-Grown Pink Synthetic Sapphire with UnusualCrystal Inclusions
Gemological testing and advanced analyses of a pink stone reveal unexpected results.
G&G 2017年秋号：HPHT合成ダイヤモンド概説、新世界から産する真珠の放射性炭素年代測定、コロンビアで発展するエメラルド産業
Gems & Gemology（宝石と宝石学）2017 年夏号の要約。