Zigzag Fingerprint in Sri Lankan Sapphire
Fiber-optic illumination reveals rectilinear zigzag-patterned films with vibrant colors in a blue sapphire.
Yellow Sapphire: Natural, Heat-Treated, Beryllium-Diffused, and Synthetic
Investigates the various chromophores responsible for color in four types of yellow sapphire.
Night Sky in Yellow Sapphire
Fiber-optic light creates a night sky scene in a yellow sapphire from Madagascar.
Pink Sapphire with Graphite Inclusion
A hexagonal platelet of graphite is discovered in a pink sapphire from Sri Lanka.
Arrow-Patterned Negative Crystals in Sapphire
Examination of a sapphire reveals negative crystals arrayed in an arrow-like pattern.
Gemological Characterization of Montana Sapphire from the Secondary Deposits at Rock Creek, Missouri River, and Dry Cottonwood Creek
Examines the mining history and geological characteristics of the three secondary sapphire deposits in the state of Montana, as well as the properties of these sapphires (unheated and heat-treated).
Chromophore Behaviors (Including the 880 nm Absorption Band) in an Irradiated Pink Sapphire
A report showing the preliminary results of a radiation experiment with pink sapphire from Madagascar.
Heated Purplish Pink Sapphire from Ilakaka (Madagascar) with Colored Monazite Inclusions
Orange-brown monazite inclusions in a purplish pink sapphire are analyzed for evidence of heat treatment.
Sean Hill: Exquisite Jewelry Designs
Former university professor Sean Hill shares some of his unique jewelry designs at the GJX show.
Color Study of Fancy Sapphire from Greenland
The Bangkok laboratory identifies the chromophores responsible for the fancy colors observed in treated sapphire from Aappaluttoq, Greenland.