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.
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
Get Your New GIA Alumni Association Logo and Support Materials
Alumni across the globe participate in chapter events and are out in full force to support the trade. There are a variety of ways you can join them.
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.
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.
合成钻石的最新进展
James Shigley（詹姆斯·史格雷）博士是 GIA 的一位特聘研究员，也是钻石和钻石鉴定领域的重要专家之一。 在 2017 年拉斯维加斯 JCK 国际珠宝展演讲中，他分享了高温高压处理 (HPHT) 和化学蒸气沉淀法 (CVD) 合成钻石的最新进展
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