Since its discovery at the beginning of the nineteenth century, infrared light has proven to be a versatile tool for scientists, industrialists, and consumers. The gem industry has benefited from the ...
Presents findings from observations of oval-, pear-, and marquise-shaped diamonds, laying the groundwork for a fancy cut grading system.
While the public is generally unaware of Mozambique as a ruby source, the deposit near Montepuez is considered by the trade to be the world’s largest supplier. Gemfields’ first Mozambique ruby auction ...
Australia’s Sapphire Legacy Australia’s sapphire industry has spurred expertise, innovation, and equipment for colored stone mining throughout the world. Along with having been a major supplier of ...
The Blue Moon diamond has a cushion modified brilliant cut, weighs 12.03 ct, and measures 15.57 × 13.47 × 7.55 mm. Its small culet facet enabled us to perform spectroscopy through the parallel faces ...
Blue color in aquamarine and yellow color in heliodor are attributed to abundant Fe ions (Wood and Nassau, 1968). Fe ions are also present in all other color varieties of beryl, though Fe content is ...
Natural pearl identification is one of the critical problems in pearl research. The DNA study of pearly mollusks and oysters facilitates solving this problem. To fulfill this goal, GIA sent a group ...
Earth’s surface is divided into tectonic plates, and the ones that make up the ocean floor are destined to sink. Sheets of oceanic crust typically bend and sink down into Earth’s interior at so-called ...
Sri Lanka has two monsoon seasons that occur at different times of the year depending on the part of the country. The northeast has monsoons from December through March. In the southwest, where most ...
Amethysts from Boudi, Morocco, are characterized by double terminations and hourglass-shaped color zoning. This study provides information about the geology of the deposit, the mining of the material ...
The Imperial Flame, a superb natural color Brazilian topaz, was fashioned from a 615 ct crystal recovered over 20 years ago. The finished piece measures 89.53 × 20.56 × 19.15 mm and weighs 332.24 ct.
This reading list gives you an opportunity to learn more about the history of Imperial topaz from the state of Minas Gerais in Brazil. Entries in the list are presented in chronological order to ...
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