Research Article Search Results
Guest in Garnet: Metal Sulfide?
An intriguing metallic inclusion is observed in a faceted garnet.
A New Treatment: Creating Phantom Structure in Opal
A newly developed treatment creates a phantom structure in opal visually similar to natural phantom opal.
CVD Diamond Over 34 Carats
A look at a 34.59 ct CVD-grown diamond examined at GIA’s Hong Kong laboratory.
Rainbow Mountain in Natural Diamond
An iridescent feather inclusion in natural diamond bears resemblance to Rainbow Mountain in Peru.
Patchy Yellow Trigon
Isolated nitrogen confined to the outer surface of a 0.98 ct diamond causes “yellow skin.”
Yellow Zoning in Pink Diamonds
Unusual natural pink diamonds displaying faint yellow color zoning and strong yellow fluorescence are studied in the Carlsbad laboratory.
An Iridescent “Insect Wing” in Diamond
A feather inclusion with iridescence caused by thin-film interference in diamond resembles an insect wing.
Internal World of Aquamarine from Xinjiang
Various inclusions are observed in a batch of aquamarine samples from Xinjiang, China.
Color Modification of Spinel by Nickel Diffusion: A New Treatment
Reports on a newly discovered treatment process for producing a deep blue color in natural spinel and proposes identification criteria.
Fire Obsidian’s Beguiling Spectrum
A look at a rare volcanic glass from central Oregon with lapidary artist Tom Dodge.
