Research Article Search Results
Special Colors and Optical Effects of Oregon Sunstone: Absorption, Scattering, Pleochroism, and Color Zoning
Details the colors and optical effects caused by metallic copper inclusions in this gem-quality feldspar.
Eclogite: Diamond-Encrusted Ancient Seafloor
Explores eclogitic diamonds, which make up a significant portion of the gem diamond market, and what they reveal about Earth’s dynamic processes.
Cause of Color in Yellow Sapphire, Plus Characterization of Oregon Sunstone, Ukrainian Beryl, and British Columbian Iolite
An overview of the Fall 2023 Gems & Gemology content.
Etch Pits in Heliodor and Green Beryl from the Volyn Pegmatites, Northwest Ukraine: A Diagnostic Feature
Examines dissolution features of heliodor and green beryl from a Ukrainian pegmatite field and offers criteria to distinguish them from samples found in other localities.
Combination of Phenomena in Star and Cat’s-Eye Color-Change Sapphire
Both asterism and chatoyancy are observed in a color-change sapphire.
Spring 2022 Auction Highlights
Large near colorless, blue, and yellow diamonds broke auction records at Christie’s and Sotheby’s in the first half of 2022.
Triplite Inclusions in Quartz from Yaogangxian, China
Pinkish orange crystal inclusions in a faceted quartz are identified as the rare phosphate mineral triplite.
Interesting Metallic Platelets in a Brazilian Paraíba Tourmaline
Microscopic observation unveils the first known instance of skeletal metallic inclusions in Brazilian Paraíba tourmaline.
2023 Sinkankas Symposium
The Nineteenth Annual Sinkankas symposium, held at GIA’s Carlsbad, California campus, focused on gems and minerals of San Diego County.
Night Sky in Yellow Sapphire
Fiber-optic light creates a night sky scene in a yellow sapphire from Madagascar.
Susan Jacques Receives Robert M. Shipley Award
GIA president and CEO Susan Jacques receives the American Gem Society’s highest honor.
A Fascinating Large South Sea Bead Cultured Pearl
An exceptionally large South Sea bead cultured pearl is examined at GIA’s Mumbai laboratory.
