True Colors of “Dalmatian Jasper”
Discusses the mineralogical composition and provenance of this spotted decorative gemstone.
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.
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.
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.
Saltwater Pearls from the Pre- to Early Columbian Era: A Gemological and Radiocarbon Dating Study
Examines 85 saltwater natural pearls, reportedly harvested from the Caribbean islands off the coast of Venezuela during the early 16th century, to determine their age.
Colombian Emerald Industry: Winds of Change
A firsthand look at Colombia’s emerald mines and the cutting and trading industry in Bogotá.
The “Montana Queen” Sapphire
Quarterly Crystal: Barite in Fluorite
A fluorite specimen hosts two eye-visible, prominent white barite inclusions.
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.
Update on Mozambique Ruby Mining and Trading
Current activity and production at various sites around Mozambique are reported.
“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.
Hematite in Quartz: “A Rose by Any Other Name”
A quartz cabochon hosts an unusual rose-shaped hematite inclusion.
Book Review: Taffin: The Jewelry of James de Givenchy
Review of Taffin: The Jewelry of James de Givenchy, by James Taffin de Givenchy, Tobias Meyere, and Hamilton South.
Silvery Rutile “Tufts” in Quartz
A Review of HPHT Synthetic Diamonds Grown forJewelry Use
Multi-Color-Zoned Quartz from Brazil
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.
Synthetic Diamond Fraudulently Inscribed To Match Natural Diamond Report
A specimen seen in the Carlsbad lab for an updated diamond grading report does not match the previous documentation.
Exhibition Review: *Gemstone Carvings: The Masterworks of Harold Van Pelt*
A review of Gemstone Carvings: The Masterworks of Harold Van Pelt at the Bowers Museum in Santa Ana, California.
Elements in Synthetic Overgrowth on Flux-Heated Ruby and Beryllium-Diffused Sapphire
Synthetic overgrowth caused by two different types of treatment are found on two samples in the Tokyo lab.
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