Curved Banding in Flame-Fusion Synthetic Sapphires
The appearance of curved banding under short-wave UV easily identifies flame-fusion synthetic sapphire.
Helical Inclusion in Colombian Emerald
A 7.54 ct natural emerald containing a 3D helical inclusion is examined by the Tokyo laboratory.
Inclusion-Rich Black Topaz from the Thomas Mountains, Utah
Topaz is an important gemstone that occurs in various colors.
Mexican Opal with Large Fluid Inclusion
Although opals generally contain water in their structure, fluid inclusions large enough to be resolved with the microscope are rare; those that can be seen with the unaided eye are exceedingly rare.
Purple Fluorite Inclusion in Emerald from Russia
Fluorite inclusions in emeralds from various localities have been reported extensively in the literature.
Pyrope-Almandine Garnet in Sapphire Host
The Bangkok laboratory recently identified a pyrope-almandine garnet in a sapphire host.
Iridescent Tabasco Geode
Tabasco geodes are a small geode variety named for the area where they are mined in the Mexican state of Zacatecas, near the city of Tabasco.
Quarterly Crystal: Dioptase in and on Quartz
Crystals of transparent colorless rock crystal quartz play host to a wide variety of mineral inclusions, some of which are highly attractive.
Euhedral Phantom Sapphire in Sapphire
A phantom sapphire crystal within a host sapphire crystal was recently examined at GIA’s Carlsbad laboratory.
Intergrown Emerald Specimen from Chivor
An emerald specimen from Chivor hosts a large, well-formed emerald inclusion.