Gem Pegmatites of Minas Gerais, Brazil: The Tourmalines of the Araçuaí Districts
First in a series, this article reviews the exploration for gemstones and mining methods in Minas Gerais, Brazil.
CVD-Grown Diamond with Unusual Cause of Greenish Color
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
