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Glassy Melt Inclusions in Sapphires from Montana
Two-phase inclusions are investigated in alluvial sapphires from deposits in Montana.
Gemological Characteristics of Coated Jadeite Jade
An Extraordinary Calcite Gemstone
The unusual effects of dispersion and twinning produced by a calcite gemstone.
Sapphires from Thammannawa, Kataragama Area, Sri Lanka
The February 2012 discovery of high-quality blue sapphires at Thammannawa near Kataragama in southeastern Sri Lanka has intensified gem mining and exploration in the surrounding area and all over the country.
"Opalite": Plastic Imitation Opal with True Play-Of-Color
Gold-Plated Gold
Visible Absorption Spectra of Colored Diamonds
Gem Paintings from Thailand
Zoned Trapiche Emerald with Goshenite Overgrowth
Radioactive Green Diamond
Snowflakes in Opal
History of Emerald Mining in the Habachtal Deposit of Austria, Part II
The finale of a two-part series on the mining history of Austrian emerald deposits in the Habachtal region.